搜搜做题作业网0.111×5.5+0.555×0.9 37.5×7.1+500×0.29+1.1×12.5 怎样简便计算?
来源：学生作业帮 编辑：搜搜做题作业网作业帮 分类：数学作业 时间：2024/07/19 02:50:17
0.111×5.5+0.555×0.9 37.5×7.1+500×0.29+1.1×12.5 怎样简便计算?
3.75×7.2+63.5×0.72-0.01×72
简便计算
3.75×7.2+63.5×0.72-0.01×72
简便计算
0.111×5.5+0.555×0.9
=0.111×5.5+0.111×4.5
=0.111×（5.5+4.5）
=0.111×10
=1.11
37.5×7.1+500×0.29+1.1×12.5
=37.5×7.1+50×2.9+1.1×12.5
=37.5×7.1+37.5×2.9+12.5×2.9+12.5×1.1
=37.5×（7.1+2.9）+12.5×（2.9+1.1）
=37.5×10+12.5×4
=375+50
=425
再问： 3.75×7.2+63.5×0.72-0.01×72 简便计算
=0.111×5.5+0.111×4.5
=0.111×（5.5+4.5）
=0.111×10
=1.11
37.5×7.1+500×0.29+1.1×12.5
=37.5×7.1+50×2.9+1.1×12.5
=37.5×7.1+37.5×2.9+12.5×2.9+12.5×1.1
=37.5×（7.1+2.9）+12.5×（2.9+1.1）
=37.5×10+12.5×4
=375+50
=425
再问： 3.75×7.2+63.5×0.72-0.01×72 简便计算