25x9.2-1.25x1.2用简便方法怎样算
问题描述:
25x9.2-1.25x1.2用简便方法怎样算
答
25×9.2-1.25×1.2
=25×4×2.3-1.25×0.8×1.5
=100×2.3-1×1.5
=230-1.5
=230-2+0.5
=228.5