9.9×25用简便方法计算

Question

9.9×25用简便方法计算，

Answer 1

9.9×25
=（10-0.1）×25
=10×25-0.1×25
=250-2.5
=247.5

Answer 2

9.9×25
=（10-0.1）x25
=10x25-0.1x25
=250-2.5
=247.5
希望能帮到你！