5
9
×
9
20
=
5
8
÷
6
7
=
1
4
+
1
5
=
16÷
4
5
=
200×15%=
1
8
+0.25
=
9÷30%= 2-
6
17
=
3
5
×
5
6
÷
3
5
×
5
6
=
17
19
×
5
6
×0÷40%
=
分析:依據(jù)分?jǐn)?shù)四則運(yùn)算的法則,即分?jǐn)?shù)乘整數(shù),用分?jǐn)?shù)的分子和整數(shù)相乘的積做分子,分母不變;分?jǐn)?shù)乘分?jǐn)?shù),用分子相乘的積做分子,分母相乘的積做分母,能約分的要約分;分?jǐn)?shù)除以一個(gè)數(shù)(0除外),等于乘這個(gè)數(shù)的倒數(shù),0乘任何數(shù)都得0,即可逐題解答.
解答:解:
5
9
×
9
20
=
1
4
5
8
÷
6
7
=
35
48
1
4
+
1
5
=
9
20
16÷
4
5
=20
200×15%=30
1
8
+0.25
=
3
8
9÷30%=30 2-
6
17
=
28
17
3
5
×
5
6
÷
3
5
×
5
6
=
25
36
17
19
×
5
6
×0÷40%
=0
點(diǎn)評(píng):此題主要考查分?jǐn)?shù)四則運(yùn)算的法則的靈活應(yīng)用.
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