2
3
=
1
4
-
1
7
=
5
6
=
5
7
×
7
10
=
0+
3
4
=
5
8
÷15=
4
5
-(
4
5
-
1
2
)=
1
2
+
3
8
=
分析:異分母分數(shù)加減法:先通分化成同分母的分數(shù),再計算;
分數(shù)乘法:分子相乘的積做分子,分母相乘的積做分母,能約分的先約分;
分數(shù)除法:除以一個不為零的數(shù)等于乘上這個數(shù)的倒數(shù);
4
5
-(
4
5
-
1
2
)根據(jù)減法的性質(zhì)簡算.
解答:解:
2
3
=
3
2
1
4
-
1
7
=
3
28
5
6
=
20
3
5
7
×
7
10
=
1
2
0+
3
4
=
3
4
5
8
÷15=
1
24
4
5
-(
4
5
-
1
2
)=
1
2
1
2
+
3
8
=
7
8
點評:本題考查了簡單的運算,要注意根據(jù)運算法則和運算定律快速準確的得出答案.
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