3⼀4×2⼀5 1⼀4×3⼀5等于多少简便算法列出来?

2024-12-30 15:33:49
推荐回答(1个)
回答1:

3/4×2/5 +1/4×3/5等于
3/4* 2/5+ 3/4* 1/5
=3/4*(2/5+1/5)
=3/4* 3/5
=9/20