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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