题目内容

怎样简便怎样算.
3
4
×
6
13
÷
9
26
4
9
÷(
1
3
+
1
3
5
9
×7+
5
9
×11
[1-(
1
4
+
3
8
)]÷
1
4
4
25
×99+
4
25
3
5
×
2
3
+
2
5
÷1
1
2
8
13
÷7+
1
7
×
6
13
1
2
×
2
5
+
9
10
÷
9
20
1
2
+
2
3
+
3
4
)×24
7
1
3
÷[1
1
4
÷(4
2
3
-
1
2
)]
2
9
+
1
2
÷
4
5
+
3
8
9
32
÷[
3
4
-(
7
16
-
1
4
)].
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则
分析:(1)按照从左到右顺序计算解答,
(2)按照先算括号里面的,再算括号外面的顺序计算解答,
(3)(5)(6)(7)(9)运用乘法分配律解答,
(4)(10)(12)按照先算小括号里面的,再算中括号里面的,最后算括号外面的顺序计算解答,
(8)按照先同时计算第二级运算,再算第一级运算顺序计算解答,
(11)按照先算除法,再运用加法结合律解答.
解答: 解:(1)
3
4
×
6
13
÷
9
26

=
9
26
÷
9
26

=1;

(2)
4
9
÷(
1
3
+
1
3

=
4
9
÷
2
3

=
2
3


(3)
5
9
×7+
5
9
×11
=
5
9
×(7+11)
=
5
9
×18
=10;

(4)[1-(
1
4
+
3
8
)]÷
1
4

=[1-
5
8
1
4

=
3
8
÷
1
4

=1
1
2


(5)
4
25
×99+
4
25

=
4
25
×(99+1)
=
4
25
×100
=16;

(6)
3
5
×
2
3
+
2
5
÷1
1
2

=(
3
5
+
2
5
)×
2
3

=1×
2
3

=
2
3


(7)
8
13
÷7+
1
7
×
6
13

=
1
7
×(
8
13
+
6
13

=
1
7
×
14
13

=
2
13


(8)
1
2
×
2
5
+
9
10
÷
9
20

=
1
5
+2
=2
1
5


(9)
1
2
×24+
2
3
×24+
3
4
×24
=12+16+18
=46;

(10)7
1
3
÷[1
1
4
÷(4
2
3
-
1
2
)]
=7
1
3
÷[1
1
4
÷4
1
6
]
=7
1
3
÷
3
10

=24
4
9


(11)
2
9
+
1
2
÷
4
5
+
3
8

=
2
9
+(
5
8
+
3
8

=
2
9
+1
=1
2
9


(12)
9
32
÷[
3
4
-(
7
16
-
1
4
)]
=
9
32
÷[
3
4
-
3
16
]
=
9
32
÷
9
16

=
1
2
点评:(1)依据四则运算计算方法正确进行计算,(2)正确运用简便方法解决问题,是本题考查知识点.
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