51.6÷[(3.4-1.25)×0.8]巧算
问题描述：
51.6÷[(3.4-1.25)×0.8]巧算
答
51.6÷[(3.4-1.25)×0.8]
=51.6÷(3.4×0.8-1.25×0.8)
=51.6÷(2.72-1)
=17.2×3÷1.72
=30