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NT
0
PL
2
15 tháng 2 2022
ab + bc + ca = abc
( a x 10 + b ) + ( b x10 + c ) + ( c x 10 + a ) = a x 100 +bx10 + c
a x11 + b x 11 +c x 11 =a x100 +bx10 + c
cùng bớt ax 11 + b x10 +c ở hai vế , ta có :
b x1 + c x10 = ax 89
a = 1
b = 9
c = 8
Vậy số abc cần tìm là 198
DP
0
LN
7
LN
2
9 tháng 4 2022
Bạn tham khảo nhé!
abc + 1107 = abc0
abc + 1107 = 10 x abc
1107 = 9 x abc
=> abc = 1107 : 9
=> abc = 123
vậy abc = 123
9 tháng 4 2022
abc + 1107 = abc0
a = 1, b = 2, c=3.
abc = 123
Gọn hơn nha!
Thanks
TL
2 tháng 3 2017
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SR
0
18 tháng 4 2022
Chiều rộng hình chữ nhật : 15 : 5 = 3 [ cm] Chu vi hình chữ nhật là: [ 15 + 3 ] x 2 = 36[cm]
Cạnh hình vuông là:
36 : 4 = 9
Diện tích hình vuông là:
9x 9 = 81 [ cm2
Đáp số : 81 cm2
mình chỉ biết làm đại số thôi bạn