1.25X5.5+0.125×45这题要怎么做啊
解题思路:简便运算核心是运用加法和乘法各种定律进行计算,计算出整数部分方便后续计算的过程
解题过程:
1.25X5.5+0.125×45=
1.25×(5.5+4.5)=
1.25×10=12.5
存疑请追问,满意请采纳
这道题的话,要把四书五变成4.5,四点5+5点5=10,然后再乘以1.25
1.25×5.5+0.125×45
=1.25×5.5+1.25×4.5
=1.25×(5.5+4.5)
=1.25×10
=12.5
1.25×5.5+0.125×45
=1.25×5.5+1.25×0.1×45
=1.25×5.5+1.25×4.5
=1.25×(5.5+4.5)
=1.25×10
=12.5