4.5×8.3-9.5×4.4+1.2×4.533.3×14.8+66.6×5.5-99.9×8.6如果可以,怎么巧算?

来源:学生作业帮助网 编辑:六六作业网 时间:2024/11/17 17:50:54
4.5×8.3-9.5×4.4+1.2×4.533.3×14.8+66.6×5.5-99.9×8.6如果可以,怎么巧算?4.5×8.3-9.5×4.4+1.2×4.533.3×14.8+66.6×5.

4.5×8.3-9.5×4.4+1.2×4.533.3×14.8+66.6×5.5-99.9×8.6如果可以,怎么巧算?
4.5×8.3-9.5×4.4+1.2×4.5
33.3×14.8+66.6×5.5-99.9×8.6
如果可以,怎么巧算?

4.5×8.3-9.5×4.4+1.2×4.533.3×14.8+66.6×5.5-99.9×8.6如果可以,怎么巧算?
解析:
4.5×8.3-9.5×4.4+1.2×4.5
原式=4.5×(8.3+1.2)-9.5×4.4
=4.5×9.5-9.5×4.4
=9.5×(4.5-4.4)
=0.95
33.3×14.8+66.6×5.5-99.9×8.6
原式=33.3×14.8+33.3×11-33.3×25.8
=33.3×(14.8+11-25.8)
=33.3×0
=0

第一题
先看4.5*8.3+4.5*1.2,那么就是4.5*(8.3+1.2)=4.5*9.5
然后就是4.5*9.5-9.5*4.4=9.5*0.1=0.95
第二题的话
33.3×14.8+66.6×5.5-99.9×8.6
=33.3×14.8+33.3×2×5.5-33.3×3×8.6
=33.3×(14.8+11-25.8)=0

(1)4.5×8.3-9.5×4.4+1.2×4.5
=4.5(8.3+1.2)-9.5×4.4……注意到8.3+1.2正好为9.5
=9.5(4.5-4.4)
=0.95
(2)33.3×14.8+66.6×5.5-99.9×8.6
=33.3(14.8+2×5.5-3×8.6)……注意到33.3可提公因式
=33.3(25.8-25.8)
=0

可以口算 第一题提取4.5 第二题提取33.3

(望采纳)

4.5×8.3-9.5×4.4+1.2×4.5
=4.5(8.3+1.2)-9.5×4.4
=4.5X9.5-9.5×4.4
=9.5(4.5-4.4)
=...
33.3×14.8+66.6×5.5-99.9×8.6

  1. =4.5×(8.3+1.2)-9.5×4.4=4.5×9.5-9.5×4.4=9.5×(4.5-4.4)=0.95

  2. =33.3×14.8+33.3×2×5.5-33.3×3×8.6=33.3×(14.8+11-25.8)=0

可以
4.5×8.3-9.5×4.4+1.2×4.5=4.5×(8.3+1.2)-9.5×4.4=4.5×9.5-9.5×4.4=9.5×(4.5-4.4)=9.5×0.01=0.095
33.3×14.8+66.6×5.5-99.9×8.6=33.3*(1*14.8+2*5.5-3*8.6)=33.3*(14.8+11-25.8)=0

4.5*8.3-9.5*4.4+1.2*4.5
=4.5*(8.3+1.2)-9.5*4.4
=4.5*9.5-9.5*4.4
=9.5*(4.5-4.4)
=0.95

33.3*14.8+66.6.*5.5-99.9*8.6
=33.3*14.8+33.3*(2*5.5)-33.3*(3*8.6)
=33.3*(14.8+11-25.8)
=33.3*0
=0

4.5×(8.3+1.2)-9.5×4.4=9.5×(4.5-4.4)=0.95

1,原式
=4.5×9.5-4.4×9.5=0.1×9.5=0.95
2.原式=33.3×(14.8+11-25.8)=0
(≧∇≦)