题目内容

3
4
×12=		 1-
5
12
=		 49×2×
1
7
=
2×
4
9
+
5
9
×2=
4
3
×
1
4
-
1
3
=
2
5
×4=
分析：49×2×
1
7
运用乘法交换律简算；
2×
4
9
+
5
9
×2运用乘法分配律简算；
其它题目根据运算法则直接求解．
解答：解：
3
4
×12=9，		 1-
5
12
=
7
12
，		 49×2×
1
7
=14，
2×
4
9
+
5
9
×2=2，
4
3
×
1
4
-
1
3
=0，
2
5
×4=
8
5
．
点评：本题考查了简单的运算，要注意根据运算法则和运算定律快速准确的得出答案．
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7
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9
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4
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5
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8
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21
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7
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3
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4
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