六年级简便计算9.865.21.25-12.50.62518

分类: 作业答案 • 2021-12-19 21:04:37

问题描述：

六年级简便计算9.8*65.2*1.25-12.5*0.625*18
过程!急用!

答

9.8*62.5*1.25-12.5*0.625*18
=9.8*6.25*12.5-12.5*0.625*18
=12.5*(9.8*6.25-6.25*1.8)
=12.5*6.25*8
=12.5*8*6.25
=100*6.25
=625

六年级简便计算9.8*65.2*1.25-12.5*0.625*18