①3/4+2/5-1/5+1/2；②2/31/5+2/32/5；③4÷4/7-4/7÷4；④（1/4+3/4）÷1/2×1/4

学习时间:2026-03-30 20:56:48 阅读：742

3/4，加上2/5，减去1/5，加上1/2，等于多少2/3，乘以1/5，加上2/3，乘以2/5，等于多少？4÷4/7-4/7，除以四等于多少？括号1/4，加上3/4，括号除以1/2×1/4等于多少？

耍酷的香菇

2026-03-30 20:56:48

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3/4+2/5-1/5+1/2

=3/4+1/5+1/2

=15/20+4/20+10/20

=（15+4+10）/20

=29/20

=1。45

2/3*1/5+2/3*2/5

=2/3*（1/5+2/5）

=2/3*3/5

=2/5

=0。4

4÷4/7-4/7÷4

=4*7/4-4/7*1/4

=7-1/7

=48/7

（1/4+3/4）÷1/2×1/4

=1÷1/8

=8

①3/4+2/5-1/5+1/2；②2/3*1/5+2/3*2/5；③4÷4/7-4/7÷4；④（1/4+3/4）÷1/2×1/4