题目内容

（
1
3
+
4
5
÷2）×
6
11
．
分析：此题应按运算顺序计算，先算括号内的除法，再算括号内的加法，最后算括号外的乘法．
解答：解：（
1
3
+
4
5
÷2）×
6
11
，
=（
1
3
+
4
5
×
1
2
）×
6
11
，
=（
1
3
+
2
5
）×
6
11
，
=
11
15
×
6
11
，
=
2
5
．
点评：此题是考查四则混合运算，解答此题应注意运算顺序以及约分简算．
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计算：
1
8
+
1
4
+
7
8
　　　   
1
2
-
1
3
+
4
5
             		 2.5-1
2
5
+
3
4
     		0.5-
1
3
+
1
4
．
直接写得数．
4
5
-
1
3
=
4
9
×6=
1
6
÷
5
6
=
1
4
+
1
4
=		 0.22=
2-1÷
3
4
=		 0.66+0.4= 0.625+
1
2
+
3
8
=		 1
2
7
-
1
5
-
4
5
=		 2.08÷0.25÷4=
直接写得数：
1-
1
4
=		 9×
1
3
=
4
5
÷2=
2
3
÷
2
3
=
3
8
+
1
8
=		 1÷
1
5
=
7
13
×1.3=
5
6
×
2
5
=
口算
1
4
×
1
3
=
4
7
÷2=
1
2
÷
1
2
=		 10÷
5
6
=
2
3
×
3
4
=
9
10
÷
1
5
=
1
6
÷6=
8
9
÷4=		 15×
4
5
=		 15÷
1
3
=
3
4
×
2
9
=
2
3
÷
1
2
=
2
5
×
1
2
=
1
2
÷
1
4
=
1
2
×
1
4
=
4
5
÷
1
5
=
3
7
×14=
1
4
÷
1
2
=
1
2
-
1
4
=
4
9
×
3
4
=
5
8
×
2
5
=
1
6
÷
2
3
=
1
2
+
1
4
=
3
5
÷1=
7
15
×5=		 1÷
3
4
=
1
2
÷
1
4
=		 1÷
3
5
=
3
4
×12=
1
5
÷
2
3
=
7
9
×
3
7
=		 1-
3
5
=		 18×
5
6
=		 7÷
7
5
=
1
3
+
1
6
=		 1+
3
5
=
2
9
×
1
4
=
8
3
÷2=
3
5
÷
2
5
=
5
9
÷3=
5
6
×
3
10
=
2
5
÷
1
2
=
8×
1
4
=		 9÷
3
4
=		 30×
1
3
=
4
5
÷2=
5
24
÷
5
6
=
5
8
×
1
2
×0=
1
3
×
3
11
=		 8÷
1
4
=
9
10
÷
3
5
=		 0÷
1
3
÷
1
2
=		 1×
9
11
=
2
5
÷
1
5
=
1
3
÷
1
3
=		 0×
2
9
÷
1
2
=
5
6
×
6
5
=
1
5
÷
1
3
=		 0÷
5
12
=		 1×
1
2
÷
1
2
=

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