题目内容

1
2
+
1
3
=
3
5
-
1
4
=
3
4
×
5
6
=		 2÷
2
7
=
1-35%=
1
2
÷
8
15
=
4
5
×25%=		 1÷
1
10
÷
1
100
=
分析：①②通分计算；③约分计算；④⑥⑧把除法改为乘法，再计算；⑤⑦把百分数化为分数计算．
解答：解：
1
2
+
1
3
=
5
6
3
5
-
1
4
=
7
20
3
4
×
5
6
=
5
8
 2÷
2
7
=7
1-35%=
13
20
1
2
÷
8
15
=
15
16
4
5
×25%=
1
5
 1÷
1
10
÷
1
100
=1000
点评：此题考查了在计算中运用通分、约分、数字转化等知识进行计算的能力．
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1000-4920÷24 1.1×（20-19.3）+2.1
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