56×7+45×7—7简便的怎么做
问题描述:
56×7+45×7—7简便的怎么做
答
56×7+45×7-7
=(56+45-1)×7
=100×7
=700
56×7+45×7—7简便的怎么做
56×7+45×7-7
=(56+45-1)×7
=100×7
=700