1
3
×
3
10
=
5
13
÷5
=
1-20%=
1
2
+
1
3
=
3
8
×
2
5
=
1-
3
5
=
1
3
÷
2
3
=
1÷
8
9
=
4
7
÷
5
14
=
1
4
×
5
9
×
4
5
=
(1+
1
5
)×
1
12
=
分析:分?jǐn)?shù)乘法,先約分,再把分子乘分子的積作分子,分母乘分母的積作分母;除以一個數(shù)(0除外),就等于乘這個數(shù)的倒數(shù);異分母分?jǐn)?shù)相加減,先化成同分母分?jǐn)?shù),再加減,據(jù)此解答即可.
解答:解:
1
3
×
3
10
=
1
10
5
13
÷5
=
1
13
1-20%=0.8
1
2
+
1
3
=
5
6
3
8
×
2
5
=
3
20
1-
3
5
=
2
5
1
3
÷
2
3
=
1
2
1÷
8
9
=
9
8
4
7
÷
5
14
=
8
5
1
4
×
5
9
×
4
5
=
1
9
(1+
1
5
)×
1
12
=
1
10
點(diǎn)評:此題主要考查分?jǐn)?shù)四則運(yùn)算法則的靈活應(yīng)用,以及學(xué)生的口算能力.
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科目:小學(xué)數(shù)學(xué) 來源: 題型:閱讀理解

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2
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3
5
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19
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200
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500
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4
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6
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3
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