题目内容

4
7
+
2
7
=
5
8
+
3
8
=
4
5
+
4
5
=
1-
5
6
=
1
2
+
1
2
=
1-
1
2
=
1
4
+
2
4

5
10
-
1
10
=
分析：根据同分母分数加减法的计算方法进行计算．
解答：解：
4
7
+
2
7
=
6
7

5
8
+
3
8
=1
4
5
+
4
5
=
8
5

1-
5
6
=
1
6

1
2
+
1
2
=1
1-
1
2
=
1
2

1
4
+
2
4
=
3
4

5
10
-
1
10
=
2
5
点评：考查了同分母分数加减法的计算，分母不变，只把分子相加减．
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相关题目
算一算．
1
4
+
2
4
=
4
5
-
1
5
=
4
7
+
2
7
=
8
10
-
3
10
=
1-
1
6
=
7
9
-
3
9
=
9
13
-
8
13
=
1
8
+
5
8
=
4
7
-
1
7
=		 647×3     208×5     67÷9    
430×8．
计算．
8÷
4
5
=		 5÷
10
11
=		 14÷
7
9
=		 6÷
2
7
=
3
11
÷
3
8
=
3
5
÷
3
7
=
8
27
÷
2
9
=
5
8
÷
3
7
=
3
5
÷3=
3
4
×2=
1
2
÷3=		 3÷
3
5
=
4
5
÷
1
5
=		 15÷
3
2
=
1
4
÷
2
3
=
4
7
+
2
7
=
3.3×2= 2.4×0.5= 0.6×0.9= 0.2×0.3=
0.39+0.61= 10-7.2= 0.88+1.1= 0.75×4=
11-1.5= 4.48-4= 7.8-0.8= 2.8×5=
4×0.3= 4×0.25= 3.2+1.6= 10.6-5.2=
0.32+1.68= 8×125= 7.28+7= 0.8+39.2=
43+0.01= 0.4×2= 1.5×6= 1×0.04=
1.53-0.5= 1.5-0.6= 0.3+1.5= 95÷5=
0.65+4.35= 14-7.4= 11.2-9.8= 4.4×2=
35-25= 56-26= 45+15= 35-15=
38+28= 15+25= 12+12= 47-27=
13+23= 1-12= 14+14= 212+312=
14-0= 610-510= 1-23= 0+56=
78-38= 29+29= 58-48= 15+45=
0.9×125×8= 5.75+1.37+4.25= 0.43×10+5.7= 62-2.8-1.2=
2.7×4+2.7×6= 0.25×0.5×4=
270÷18= 1.25-0.25+0.75= 3.4-1.4= 99×2.3+2.3=
5-
2
9
+
7
9
=
1
2
+
1
3
-
1
2
+
1
3
=
1
6
+
5
6
=
9
10
-
3
10
=
45×101=
5
9
×6=
2
5
+
1
5
=
4
7
-
2
7
=
5
8
+
1
8
=
1
6
+
1
6
=
2
3
-
1
3
=
9
10
+
1
10
=
7
12
-
5
12
=
25
5
-
10
5
=		 1-
2
5
=
1
3
+
2
3
=
直接写得数．
26÷4=		 700-70= 12÷5=
25×4×0= 400×5= 75+26=
71÷8=
4
7
-
2
7
=		 1-
5
8
=
7
13
+
4
13
=		 1千米-650米=
 
米      		 1分-
 
秒=35秒        
503×7≈ 2厘米+8厘米=
 
分米     		 3吨+2吨=
 
千克      
398×4≈

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