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2 tháng 11 2018
occhovb
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
                                                                                                   
28 tháng 8 2021

a)(1377-181)'/.3

28 tháng 8 2021

Mn bày e gấp

 

28 tháng 8 2021

a) ko

b) có

c)ko

d) có

28 tháng 8 2021

a,ko chia hết cho 9,3

b,chia hết cho 9,3

c,chia hết cho 9,3

d,chia hết cho 3 ko chia hết cho 9

tick mik nha

3 tháng 1 2019

1012 – 1 = Giải sách bài tập Toán 6 | Giải bài tập Sách bài tập Toán 6

Tổng các chữ số bằng 9 + 9 + … + 9 = 99 chia hết cho 3 và 9

Do đó 1012 – 1 chia hết cho cả 3 và 9.

13 tháng 9 2018

1010 + 2 = Giải sách bài tập Toán 6 | Giải bài tập Sách bài tập Toán 6

Tổng các chữ số bằng 1 + 0 + 0 + … + 0 + 2 = 3 chia hết cho 3 nhưng không chia hết cho 9

Do đó 1010 + 2 chia hết cho 3 nhưng không chia hết cho 9.

11 tháng 10 2018

a,Vì 1251+5361=6612 nên chia hết cho 3 nhưng ko chia hết cho 9

(6+6+1+2=15)

b, Vì 1.2.3.4.5.6+27=747 nên chia hết cho 3,9

(7+4+7=18)

HQ
Hà Quang Minh
Giáo viên
2 tháng 10 2023

1.

 a) (1 954 + 1 975 )\(\not{ \vdots }\)2

Vì 1 954 có chữ số tận cùng là 4 chia hết cho 2 và 1 975 có chữ số tận cùng là 5 không chia hết cho 2

 b) (2 020 – 938) \( \vdots \) 2

Vì 2 020 và 938 có chữ số tận cùng là 0 và 8 nên đều chia hết cho 2.

2.

a) (1 945 + 2 020)\( \vdots \)5

Vì 1 945 và 2 020 có chữ số tận cùng là 5 và 0 nên đều chia hết cho 5

b) (1 954 – 1930) \(\not{ \vdots }\)5

Vì 1 954 có chữ số tận cùng là 4 không chia hết cho 5 và 1 930 có chữ số tận cùng là 0 chia hết cho 5.

29 tháng 3 2018

a, 2.3.4.5.6 + 82 ⋮ 2

b, 2.3.4.5.6 – 95 ⋮ 5