问题描述: 人教版六年级上册数学书练习三第三题过程与答案 1个回答 分类:数学 2014-12-03 问题解答: 我来补答 3.计算下面各题.1/3乘以3/5+1 5/7-5/9乘以5/7 1-5/7乘以21/25 1/2+4/5乘以4/5 1/6乘以(5-2/3) =1/5+1 =(1-5/9)乘以5/7 =1-3/5 =1/2+1 =1/6乘以5-1/6乘以2/3=1又1/5 =4/9乘以5/7 =2/5 =1又1/2 =5/6-1/9=20/63 =13/187/8乘以7+3/8=49/8+3/8=2/13 展开全文阅读