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a. Ta tính trước số bị chia: 1 + 4 + 7 + …… + 100
Dãy số gồm có: (100 – 1) : 3 + 1 = 34 (số hạng)
Ta thấy: 1 + 100 = 4 + 97 = 101 = …..
Do đó số bị chia là: 101 x 34 : 2 = 1717
Ta có: 1717 : a = 17
a = 1717 : 17
a = 101
vậy a = 101.
b.
x - 1 2 × 5 3 = 7 4 - 1 2 x - 1 2 × 5 3 = 5 4 x - 1 2 = 5 4 : 5 3 x - 1 2 = 3 4 x = 3 4 + 1 2 x = 5 4
c. 2000 2001 v à 2001 2002
Ta có: 1 - 2000 2001 = 1 2001
1 - 2001 2002 = 1 2002
Vì 1 2001 > 1 2002 nên 2000 2001 < 2001 2002
Dãy số 1; 4; 7; ......; 28 có khoảng cách đều là 3.
Ta có số các số hạng trong dãy số là: (28 - 1) : 3 + 1 = 10 (số hạng)
Tổng các số tự nhiên trong dãy số từ 1; 4; 7; .....; 28 là: 1 + 4 + 7 + .... + 28 = (1 + 28) x 10 : 2 = 145
Như vậy (x + 1) + (x + 4) + (x + 7) + .... + (x + 28) = 195
=> 10x + 145 = 195
=> 10x = 195 - 145
=> 10x = 50
=> x = 5
Đáp số: x = 5
1. ( 28 + 34 + 41 + 45 ) : 4
= 148 : 44
= 37.
( 1/2 + 3/4 + 4/5 ) : 3
= 41/20 : 2
= 41/60.
( 3,52 + 0,71 + 6,04 + 5,12 + 4,46 ) : 5
= 19,85 : 5
= 3,97.
Mình làm theo suy nghĩ thui đúng thì bn ****!
(28 + 34 + 41 + 45) : 4= 148 : 4
=37
(3,52 + 0,71 + 6,04 + 5,12 + 4,46) : 5 = 19,85 : 5
=3,97
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Gọi 2 số cần tìm là A và A + 2
Theo đề bài ra ta có: A + (A+2) = 1362\(\Rightarrow\) 2xA + 2 =1362 Suy ra 2xA = 1360 Suy ra: A = 1360 : 2 = 680
Vậy hai số cần tìm là 680 và 682
hai số chẵn liên tiếp co khoảng cách là 2
SB : (1362 - 2) : 2 = 680
SL : 680 + 2 = 682
Tìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
Toán lớp 5 Tìm xTìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
- 49,8 - x : 2,4 = 29,8
Tìm x:
- x . 7 + x . 12 =266
- x . 3,5 - x . 1,7 = 81,486
- 49,8 - x : 2,4 = 29,8
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
- (x-12 ) . 2 + 3 = 7
- ai giúp mk thì mk k ^.^
1. x.7 + x.12 = 266
x.(7+12) = 266
x.19 =266
x = 266:19
x = 14
2. x.3,5-x.1,7 = 81,486
x.(3,5-1,7) = 81,486
x.1,8 = 81,486
x = 81,486 : 1,8
x = 45,27
3. (x- \(\frac{1}{2}\) ) .2 + 3 = 7
\(\left(x-\frac{1}{2}\right).2=7-3=4\)
\(x-\frac{1}{2}=4:2=2\)
\(x=2-\frac{1}{2}\)
\(x=\frac{3}{2}\)
1B 2C 3 Có j đó hơi sai sai 4C 5C 6d
7C 8C 9B 10B
nếu đúng thì kb vs ủng hộ nha
Câu 1 :
B. 1,69
Câu 2 :
C. 80%
Câu 3 :
B. 15/20 và 12/20
Câu 4 :
C. 10 ha
Câu 5 :
C. 4500
Câu 6 :
D. 25%
Câu 7 :
C. 33,1
Câu 8 :
C. 3,9
Câu 9 :
B. 3/1000
Câu 10 :
B. 3914 viên gạch
Khi chuyển dấu phẩy của A sang trái 2 hàng tức số A giảm đi 100 lần. Ta có: Số mối sẽ là A: 100
A - A: 100 = 196,911 \(\Rightarrow\) 99 A = 19691,1 \(\Rightarrow\) A = 198,9
2% của 1000 kg là :
1000 : 100 x 2 = 20 (kg)
15% của 36 m là :
36 : 100 x 15 = 5,4 (m)
Đáp số: 20 kg; 5,4 m
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