题目内容

【题目】计算下面各题,能简算的要简算。

23 /28+(13/14+2/7) 11/12+(3/4-1/2) 15/11-3/8-5/8

2/3+1/5-2/3+1/5 22/15+7/13+8/15-7/13 8/9+5/6-7/9

【答案】57/28 7/6 4/11 2/5 2 17/18

【解析】

23/28+(13/14+2/7)

=23/28+26/28+8/28

=57/28

11/12+(3/4-1/2)

=11/12+(9/12-6/12)

=7/6

15/11-3/8-5/8

=15/11-(3/8+5/8)

=15/11-1

=4/11

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

=2/3-2/3+1/5+1/5

=2/5

22/15+7/13+8/15-7/13

=(22/15+8/15)+(7/13-7/13)

=2

8/9+5/6-7/9

=(8/9-7/9)+5/6

=1/9+5/6

=2/18+15/18

=17/18

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