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通分計(jì)算;③約分計(jì)算;④⑥⑧把除法改為乘法,再計(jì)算;⑤⑦把百分?jǐn)?shù)化為分?jǐn)?shù)計(jì)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
點(diǎn)評(píng):此題考查了在計(jì)算中運(yùn)用通分、約分、數(shù)字轉(zhuǎn)化等知識(shí)進(jìn)行計(jì)算的能力.
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