63.2×0.1+6.32×9
=63.2×0.1+63.2×0.9
=63.2×(0.1+0.9 )
=63.2×1
=63.2数字错了是63.2×0.1+6.32×9你变成63.2×0.1+63.2×0.96.32×9 =63.2×0.9一个乘数扩大10倍，另一个乘数缩小10倍，积不变