Question

1.08×2.5的验算算式。

Answer 1

如下：

1.08×2.5

=1.08×10/4

=10.8/4

=2.7

2.7/2.5

=2.7×4/10

=10.8/10

=1.08

商随被除数和除数变化的规律：

1、被除数和除数同时乘或除以一个非零数，商不变。

2、被除数扩大（或缩小）几倍，除数不变，商就扩大（或缩小）几倍。

3、被除数不变，除数扩大（或缩小）几倍，商就缩小（或扩大）几倍。

4、被除数扩大a倍，除数缩小b倍，则商扩大a×b倍。

Answer 2

1.08X2.5
=(1+0.08)X2.5
=1X2.5+0.08X2.5
=2.5+0.2
=2.7

望采纳

Answer 3

1.08×2.5
=1.08×10/4
=10.8/4
=2.7
2.7/2.5
=2.7×4/10
=10.8/10
=1.08