题目内容

1
4
+
2
4
=		 1-
1
8
=
3
8
+
5
8
=
9
10
-
3
10
=
7
9
-
4
9
=		 1-
5
7
=
5
6
+
1
6
=
3
5
-
2
5
=
分析：此题属于同分母分数的加减法，只把分子相加减，分母不变，据此解答．但要注意“1”应划成与分数分母相同的分数，再计算．
解答：解：
1
4
+
2
4
=
3
4
                        1-
1
8
=
7
8
                                   
3
8
+
5
8
=1
9
10
-
3
10
=
3
5
                         
7
9
-
4
9
=
1
3
                                   1-
5
7
=
2
7

5
6
+
1
6
=1                            
3
5
-
2
5
=
1
5
点评：此题考查了同分母分数的加减法，掌握方法，很容易解决．
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相关题目
直接写出得数
1
4
+
2
4
=		 1+
3
5
=
1
3
-
1
9
=
5
7
-
3
7
=
2-
1
3
=
2
3
+
1
6
=
2
5
-
1
3
=
1
5
+
1
4
=
3-
1
4
=		 2+
1
6
=		 1.5-
7
10
=		 0.5+
1
4
=
2.5+
1
2
=
1
6
+0.5=
1
3
-0.25=
3
4
-0.7=
1.23÷3= 0.8×11= 1-0.75=
1.7×0.4= 0.36÷12= 1.6+0.38=
1.2÷0.3= 0.75×4= 15×0.4=
2.14-0.9= 4×0.25= 10÷2.5=
0.4×52= 1.6×0.4= 9.6÷6=
4.3-0.4= 7-6.2= 0.86-0.3=
8.8÷2.2= 2.6÷0.2= 0.15×3=
0.9÷0.45= 0.27÷3= 0.51+1.7=
0.6÷0.5= 0.125×8= 0.38×1000=
6.8-1.7= 2.4×0.2= 32.8+19=
0.56÷14= 1÷0.05= 6÷12=
0.14×5= 3×1.4= 4.9÷0.7=
0.4÷8= 6.3+3.7= 3.5×0.2=
0.2×12.6×5= 8.4÷4.2= 2.4×0.5=
0÷3.5×0.2= 0×9.7+2.3= 1.6×9+1.6=
3.8+1.2= 4.8÷0.3= 530+270=
7.6÷3.8= 92÷2.3= 9.6-1.6=
7.2+2.8= 2.63+0.37= 0.67+1.24=
0.3×101=
 		 0.25×8=
 		 16÷1.6=
 
26.1-3.5-7.5=
 		    
 计算：
1
4
+
2
4
=		 1-
5
6
=
8
9
-
3
9
=
1
6
+
2
6
=
1
2
+
1
2
=
5
8
-
2
8
=
3
7
+
4
7
=		 1-
1
5
=
2
6
+
4
6
=
3
12
+
8
12
=
口算．
100-7=
17+8=
60÷8=
25×4=
600×5= 42÷6= 510×7≈ 2000×8=
7
8
-
4
8
=
1
4
+
2
4
=		 1-
6
11
=
1
7
+
6
7
=

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