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口算.
1
3
×
3
5
=

1
3
=

2
5
×10=

2
3
=

2
5
+
3
5
=
3
8
÷
1
2
=
1-
4
7
=
5
7
-
3
7
=
1
5
+
1
3
=
1.8×3=
分析:分数乘法:分子相乘的积作为分子,分母相乘的积作为分母;分数除法:除以一个数等于乘这个数的倒数;同分母分数相加减,分母不变,分子相加减;异分母分数相加减,先通分化成同分母的分数,再计算.
解答:解:
1
3
×
3
5
=
1
5

1
3
=15,

2
5
×10=4,

2
3
=0,

2
5
+
3
5
=1,
3
8
÷
1
2
=
3
4
1-
4
7
=
3
7
5
7
-
3
7
=
2
7
1
5
+
1
3
=
8
15
1.8×3=5.4.
故答案为:
1
5
,15,4,0,1,
3
4
3
7
2
7
8
15
,5.4.
点评:本题考查了分数的基本运算,注意运算的法则,把结果化成最简分数.
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