题目内容

直接写出得数：
3
4
+
5
6
=
2
3
-
1
4
=		 7-
5
7
=
1
2
+
2
3
=
5
8
+
1
3
=
1
2
-
1
5
=
分析：利用分数加减法法则直接计算即可．
解答：
解：
3
4
+
5
6
=
19
12
2
3
-
1
4
=
5
12
7-
5
7
=6
2
7
1
2
+
2
3
=
7
6
5
8
+
1
3
=
23
24
1
2
-
1
5
=
3
10
．
点评：注意异分母分数加减先通分再加减，计算结果的要约成最简分数．
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3
4
×16=		 10÷
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10
=
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12.56÷6.28= （
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直接写出得数．
3
4
×
4
9
=		 0×
2
13
=		 16×
3
5
=
1÷
3
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=
4
5
÷
3
5
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9
÷
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×
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=
直接写出得数．
3
4
÷
3
4
=
1
7
×
3
10
=		 18×
1
6
=
1
3
÷3=		 3.2-
9
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=
1
2
+
1
5
=
10÷
1
5
=		 6.8×80=
直接写出得数．
3
4
×12=
5
7
÷
4
7
=		 （ 
2
3
）2=		 4-4×
3
4
=		 1
5
7
×
7
12
=		 43÷
1
10
=
8
9
÷
9
8
=
5
4
×8+
1
4
×8=		 0.9×
2
3
=		 12×
5
11
-
5
11
=
4
7
×7÷
4
7
×7=
3
8
+…+
3
8
64
=
直接写出得数．
3
4
×40=
3
2
÷
1
2
=		 25×
3
5
=
7
9
×
3
7
=
14
15
÷7=
4
9
÷
2
3
=		 1-50%=
1
3
÷
2
7
=
5
6
×
3
10
=		 62.5%÷
5
8
=

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