Question

Tính nhanh ( hướng dẫn mìn cách làm nha)

a,38x7+7x62-100x5

b,(16x6+16x3+16)-(12x6+12x3+12)

Answer 1

a) `38xx7+7xx62-100xx5`

`= 7(38+62)-500`

`= 7.100-500`

`= 700-500`

`= 200`

b) `(16xx6+16xx3+16)-(12xx6+12xx3+12)`

`= [16(6+3+1)]-[12(6+3+1)]`

`= 16xx10-12xx10`

`= 10(16-12)`

`= 10xx4`

`= 40`

Answer 2

a: \(=7\cdot100-100\cdot5=200\)

b: \(=\dfrac{16\left(6+3+1\right)}{12\left(6+3+1\right)}=\dfrac{16}{12}=\dfrac{4}{3}\)