Question

Tính nhanh:

a) 23 x 4 + 23 x 6

b) 15 x 45 + 15 x 55

Answer 1

`a) 23 xx 4 + 23 xx 6`

`= 23 xx (4 + 6)`

`= 23 xx 10`

`= 230`

`b) 15 xx 45 + 15 xx 55`

`= 15 xx (45 + 55)`

`= 15 xx 100`

`= 1500`

Answer 2

23x4+23x6=92+138=230

15x45+15x55=675+825=1500

Answer 3

a) 23 x 4 + 23 x 6= 92 + 138

                           = 230

b) 15 x 45 + 15 x 55= 675 + 825

                                = 1500