Question

tính bằng cách hợp lí:

4x113x25-5x112x20

Answer 1

4 x 113 x 25 - 5 x 112 x 20

= 100 x 113 - 100 x 112

= 100 x (113 - 112)

= 100 x 1

= 100

Answer 2

4x113x25-5x112x20

 =(4x25)x113-(5x20)x112

=100x113-100x112

=11300-11200

=100