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:搜搜考试网作业帮 分类:数学作业 时间:2024/08/12 18:08:33
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 37.5×7.1+500×0.29+1.1×12.5 怎样简便计算?](/uploads/image/z/4951659-3-9.jpg?t=0.111%C3%975.5%2B0.555%C3%970.9+37.5%C3%977.1%2B500%C3%970.29%2B1.1%C3%9712.5+%E6%80%8E%E6%A0%B7%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%3F)
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