题目内容

直接写出得数．
1
3
+
1
3
=		 1-
2
5
=
5
8
-
3
8
=
1
7
+
3
7
+
2
7
=
1-
5
6
=
3
8
+
5
8
=
2
9
+
5
9
=		 1-
5
12
-
7
12
=
3
4
-
1
2
=
1
6
+
2
3
=
1
2
-
1
3
=
3
8
+
3
8
-
5
8
=
分析：根据分数加减法的计算方法进行计算．
1-
5
12
-
7
12
根据减法的性质进行简算．
解答：解：
1
3
+
1
3
=
2
3
 1-
2
5
=
3
5
5
8
-
3
8
=
1
4
1
7
+
3
7
+
2
7
=
6
7
1-
5
6
=
1
6
3
8
+
5
8
=1
2
9
+
5
9
=
7
9
 1-
5
12
-
7
12
=0
3
4
-
1
2
=
1
4
1
6
+
2
3
=
5
6
1
2
-
1
3
=
1
6
3
8
+
3
8
-
5
8
=
1
8
点评：口算时，注意运算符号和数据，然后再进一步计算．
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相关题目
 直接写出得数．
1
3
+
1
3
=
1
4
+
1
2
=
7
8
-
4
8
=
1-
5
16
=
1
4
+
3
4
=
5
9
-
1
9
=
1-
2
11
=
7
9
+
2
9
=
6
7
+
1
7
=
1
5
+
2
5
=
9
10
-
9
10
=		 1-
5
7
=
直接写出得数．
13.4-8=		 5.6+3.4= 0.5÷0.125= 10-2.3= 7.5×0.4=
2.3×4×0= 16÷3.2= 3.5÷0.5= 0.55+0.45= 0.06×0.7=
0.125×80=
（2012?中山模拟）
直接写出得数
2
5
+
1
3
=
1
5
-
1
6
=		 636-198= 24÷
3
4
=
7
9
×45=
36-18= 0.48÷0.3=  2.5×40= 7÷19= 3.7×1000=
18×1%= 1-
6
7
=
7
8
÷
3
4
=		 0÷9.9= 3.6÷0.036=
1
3
×15=		  0.92= 10：0.2=
3
5
÷15=		  
1
2
÷
3
4
=
0.125×20×8=
1
5
÷
1
7
=		  1÷
2
3
=
3
4
×8=
3
22
×11=
10+
5
7
=		  
1
2
×
2
3
=		 1+20%= 8÷
4
5
=		 20÷0.4=
直接写出得数
（
1
3
-
1
4
）×12=		 1
3
5
÷
3
4
=
5
6
×
3
10
=
3
5
÷3=
4
11
÷
2
11
=
7
9
÷
2
9
=
1
5
÷
1
5
18×
5
6
=
3
4
+
1
5
=
1
4
×4÷
1
4
×4=
直接写出得数：
1
3
-
1
4
=
9
14
×
7
12
=
5
8
÷
5
12
=		 15÷
5
8
=
4
5
吨：450千克=
1
4
÷
1
2
=		 0.1÷
1
100
=
1
7
×2.1=
3
4
X+
1
2
X=		 0.125×0.25=

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