56.5×9.9+56.5巧算
问题描述:
56.5×9.9+56.5巧算
答
56.5x9.9+56.5
=56.5x(9.9+1)
=56.5x(10+0.9)
=56.5x(10+1-0.1)
=565+56.5-5.65