题目内容

2
9
×
4
5
=
4
7
×
7
12
=
2
5
×
5
8
=
3
10
×
4
9
=
7
8
×
24
35
=		 15×
9
20
=
5
12
×36=
2
5
×
3
4
=
分析：计算分数乘法时，分子和分子相乘的积做分子，分母和分母相乘的积做分母，能约分的先约分再相乘，据此解答即可．
解答：解：
2
9
×
4
5
=
8
45
4
7
×
7
12
=
1
3
2
5
×
5
8
=
1
4
3
10
×
4
9
=
2
15
7
8
×
24
35
=
3
5
 15×
9
20
=
27
4
5
12
×36=15
2
5
×
3
4
=
3
10
点评：此题主要考查分数乘法的计算方法的灵活应用．
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简算下面各题．
16
5
-(
11
5
+
2
9
)
4
5
+
4
16
-
4
5
+
4
16
3
7
+
7
15
+
4
7
+
8
15
．
2
9
×
4
5
=
4
7
×
7
12
=
2
5
×
5
8
=
3
10
×
4
9
=
7
8
×
24
35
=		 15×
9
20
=
5
12
×36=
2
5
×
3
4
=
2
9
×
4
5
=
4
7
×
7
12
=
2
5
×
5
8
=
3
10
×
4
9
=
7
8
×
24
35
=		 15×
9
20
=
5
12
×36=
2
5
×
3
4
=

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