8.7×2.5+0.87×7.5简便计算_数学解答

8.7×2.5+0.87×7.5简便计算

人气：362 ℃　时间：2020-06-03 09:06:40

解答

8.7×2.5+0.87×7.5
=8.7×2.5+2.61×2.5
=(8.7+2.61)×2.5
=11.31X2.5X4/4
=113.1/4
=28.275