题目内容

【题目】计算下面各题,能简算的要简算.

+ ﹣( 1+

﹣(+ 1+ 9+99+999+9999+2

【答案】23/24; 3/8; 1;

1/5; 27/20; 11110

【解析】

7/8+11/12﹣5/6

=43/24﹣5/6

=23/24

5/8﹣(5/12﹣1/6)

=5/8﹣1/4

=3/8

18/9﹣5/7+1/9﹣2/7

=(18/9+1/9)﹣(5/7+2/7)

=2﹣1

=1

13/12﹣(1/12+4/5)

=13/12﹣1/12﹣4/5

=1﹣4/5

=1/5

1﹣1/4+3/5

=3/4+3/5

=27/20

9+99+999+9999+2

=9+99+999+9999++++

=9+)+(99+)+(999+)+(9999+

=10+100+1000+10000

=11110

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