作业帮2 又 1/2-3/4+3/7 2.3 5/12+1/4-2 2/31.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/30 02:13:35
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2 又 1/2-3/4+3/7 2.3 5/12+1/4-2 2/31.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2
2 又 1/2-3/4+3/7 2.3 5/12+1/4-2 2/3
1.2 1/2-3/4+3/7
2.3 5/12+1/4-2 2/3
3.3 3/4-3 3/5+4 1/12
4.12 1/3-26+1/15
5.8 3/10-21/5+1/2
2 又 1/2-3/4+3/7 2.3 5/12+1/4-2 2/31.2 1/2-3/4+3/7 2.3 5/12+1/4-2 2/33.3 3/4-3 3/5+4 1/124.12 1/3-26+1/155.8 3/10-21/5+1/2
1. 2又 1/2-3/4+3/7
=1又3/4+3/7
=2又5/28
2. 3又 5/12+1/4-2 又2/3
=（3又5/12-2又2/3）+1/4
=3/4+1/4
=1
3. 3 又3/4-3又 3/5+4又 1/12
=（3又3/4+4又1/12）-3又3/5
=7又5/6-3又3/5
=4又7/30
4.12又 1/3-2又5/6+1/15
=9又1/2+1/15
=9又17/30
5.8 又3/10-2又1/5+1/2
=6.1+0.5
=6.6