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191问答库 > 3⼀4+1⼀2简便8⼀9-1⼀3简便5⼀6-2⼀3简便1⼀3-11⼀15简便？

3⼀4+1⼀2简便8⼀9-1⼀3简便5⼀6-2⼀3简便1⼀3-11⼀15简便？

1又(2⼀9+7⼀15）简便

2025-03-15 11:52:53

推荐回答（3个）

回答1：

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

8/9-1/3
=8/9-3/9
=5/9
(3)

5/6-2/3
=5/6-4/6
=1/6
(4)

1/3-11/15
=5/15-11/15
=-6/15
=-2/5
(5)
1又2/9+7/15
=1+（2/9+7/15）
=1+（10/45+21/45）
=1又31/45

回答2：

这些题不是简便计算，是把分母通分:
3/4+1/2=3/4+2/4=5/4
8/9-1/3=8/9-3/9=5/9
5/6-2/3=5/6-4/6=1/6
1/3-11/15=5/15-11/15=-6/15=-2/5

回答3：

3/4+1/2=3/4+2/4=5/4=1 1/4
8/9-1/3=8/9-3/9=5/9
5/6-2/3=5/6-4/6=1/6
1/3-11/15=5/15-11/15=-6/15=-2/5

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