递等式计算:48×0.25×1.25=?简便计算_数学解答

递等式计算:48×0.25×1.25=?简便计算

人气：292 ℃　时间：2020-04-14 21:54:34

解答

48×0.25×1.25
=(40+8)×0.25×1.25
=40×0.25×1.25 +8×1.25×0.25
=10×1.25 +10×0.25
=12.5 +2.5
=15