你好,运用乘法分配律进行简便计算
原式=(56+45-1)×9
=100×9
=900
希望可以帮到你。
56×9+45×9-9
=(56+45+1)×9
=100x9
=900
56×9+45×9-9
=56×9+45×9-1×9
=(56+45-1)×9
=100×9
=900
56×9+45×9-9
=9*(56+45-1)
=9*100
=900
56×9+45×9-9
=56×9+45×9-1×9
=(56+45-1)×9
=100×9 =900