直接寫得數(shù):
3-
1
3
=
8
15
÷
4
15
=
3
4
×
3
8
=
1
3
÷6=
9.1÷7=
15
16
÷
15
16
=
1
2
+
1
5
=
3
4
÷
1
2
=
5
6
=
2
9
×
3
8
=
分析:分?jǐn)?shù)加減法:要注意先通分成同分母分?jǐn)?shù),再分母不變,分子相加減;
分?jǐn)?shù)乘法:分子和分母先交叉約分,再計(jì)算;
分?jǐn)?shù)除法:先把除法算式改寫成被除數(shù)乘除數(shù)的倒數(shù),再按照分?jǐn)?shù)乘法的法則進(jìn)行計(jì)算.
解答:

解:3-
1
3
=2
2
3
,
8
15
÷
4
15
=2,
3
4
×
3
8
=
9
32
,
1
3
÷6=
1
18
9.1÷7=1.3,
15
16
÷
15
16
=1,
1
2
+
1
5
=
7
10
,
3
4
÷
1
2
=
3
2
5
6
=
10
3
,
2
9
×
3
8
=
1
12
點(diǎn)評(píng):此題考查學(xué)生快速計(jì)算的能力,要注意看清運(yùn)算符號(hào),根據(jù)數(shù)據(jù)的特點(diǎn),選用自己喜歡的方法計(jì)算.
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