4⼀5加1⼀4括号乘与3⼀7加7⼀10用简便计算

2024-12-05 11:49:14
推荐回答(1个)
回答1:

4/5+1/4×(3/7+7/10)
=4/5+1/4×79/70
=4/5+79/280
=303/280