问题
解答题
用简便方法计算
392.6×192-39260×0.93;25×23-30×2.5.
答案
(1)392.6×192-39260×0.93
=39260×1.92-39260×0.93
=39260×(1.92-0.93)
=39260×0.9
=39260×(1-0.1)
=39060-39260×0.1
=39260-3926
=35334;
(2)25×23-30×2.5
=25×23-3×(10×2.5)
=25×23-3×25
=25×(23-3)
=25×20
=500.