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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