Question

2.5x4.8的三种简便方法

Answer 1

2.5×4.8
=2.5×4×1.2
=10×1.2
=12
2.5×4.8
=2.5×4+2.5×0.8
=10+2
=12
2.5×4.8
=（2.5×4）×（4.8÷4）
=10×1.2
=12
2.5×4.8
=2.5×5-2.5×0.2
=12.5-0.5
=12