直接寫出得數(shù).
4
11
×
33
34
=
5
8
×
2
5
=
1-
4
9
=
7
8
×6÷
7
8
=
6
7
÷
6
7
=
11
4
=
9
10
÷
1
5
=
6+
3
8
=
1
2
×
4
3
=
8
9
÷
2
3
=
3
16
×
4
15
=
13
19
÷
39
38
=
分析:分?jǐn)?shù)加減法的計(jì)算方法:先通分成同分母分?jǐn)?shù),再分母不變,把分子相加減;
分?jǐn)?shù)乘法的計(jì)算方法:分母和分母相乘的積做分母,分子和分子相乘的積做分子,能約分的要先約分再計(jì)算;
分?jǐn)?shù)除法的方法:除以一個(gè)不等于0的數(shù),等于乘這個(gè)數(shù)的倒數(shù),進(jìn)而按照分?jǐn)?shù)乘法的計(jì)算方法計(jì)算得解.
解答:解:
4
11
×
33
34
=
6
17
5
8
×
2
5
=
1
4
1-
4
9
=
5
9
7
8
×6÷
7
8
=6
6
7
÷
6
7
=1
11
4
=0
9
10
÷
1
5
=
9
2
6+
3
8
=6
3
8
1
2
×
4
3
=
2
3
8
9
÷
2
3
=
4
3
3
16
×
4
15
=
1
20
13
19
÷
39
38
=
2
3
點(diǎn)評(píng):本題考查分?jǐn)?shù)四則運(yùn)算的計(jì)算方法,計(jì)算時(shí)要細(xì)心,注意把結(jié)果化成最簡(jiǎn)分?jǐn)?shù);要注意:混合運(yùn)算中只有乘除法時(shí),先把除以一個(gè)數(shù)改寫成乘這個(gè)數(shù)的倒數(shù),再約分計(jì)算得解.
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