0.25 x 7.9 x 0.5简便算法_数学解答

0.25 x 7.9 x 0.5简便算法

人气：137 ℃　时间：2020-04-23 14:47:08

解答

0.25*7.9*0.5
=0.25x0.5x(8-0.1)
=0.25x0.5x8-0.25x0.5x0.1
=0.125x8-0.125x0.1
=1-0.0125
=9.9875