2
5
×
5
6
=
1
3
1
3
7
8
-
5
8
=
1
4
1
4
20÷
10
11
=
22
22
0.125+
7
8
=
1
1
4
1
2
-2.2
=
2.3
2.3
4
4
5
×
1
8
=
3
5
3
5
4
5
÷2
2
3
=
3
10
3
10
3
1
3
+7
2
7
=
10
13
21
10
13
21
4-2
1
3
=
1
2
3
1
2
3
2
35
×10.5
=
0.6
0.6
分析:此題分為三個(gè)類型:(1)分?jǐn)?shù)的加法減法,先通分,化為同分母的分?jǐn)?shù),分母不變,分子相加、減;(2)分?jǐn)?shù)的乘法,分子和分子相乘做分子,分母和分母相乘做分母,能夠約分的要先約分;(3)分?jǐn)?shù)除法,除以一個(gè)數(shù)對(duì)應(yīng)乘這個(gè)數(shù)的倒數(shù).
解答:
解:①
2
5
×
5
6
=
1
3
7
8
-
5
8
=
1
4
20÷
10
11
=22
0.125+
7
8
=1
4
1
2
-2.2
=2.3
4
4
5
×
1
8
=
3
5
4
5
÷2
2
3
=
3
10
3
1
3
+7
2
7
=10
13
21
4-2
1
3
=1
2
3
2
35
×10.5
=0.6.
點(diǎn)評(píng):此題主要考查了分?jǐn)?shù)的加法和減法的計(jì)算方法及分?jǐn)?shù)乘法和除法的計(jì)算方法,注意結(jié)果要化為最簡(jiǎn)分?jǐn)?shù).
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