(4-0.4)*2.5=9的简便方法,
问题描述:
(4-0.4)*2.5=9的简便方法,
答
(4-0.4)×2.5
=4×2.5-0.4×0.25
=10-1
=9
(4-0.4)*2.5=9的简便方法,
(4-0.4)×2.5
=4×2.5-0.4×0.25
=10-1
=9