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3
4
=
3
4
×10%=
3
4
×8=
15÷1%=
1.05-
1
2
=
2
3
÷
3
2
=
1
4
-
1
5
)×
1
20
=
3
4
×
5
6
÷
5
6
×
3
4
=
8
9
+
1
9
X=2                
X:
1
4
=12:
1
5
3.2
X
=0.5
5
6
÷(1-
9
20
)×
1
5
2
5
×
6
11
+40%×
5
11
9
16
÷(
3
8
+
1
16
)                 
24
19
+
16
17
)×
1
8
+
15
17
分析:(1)除以一个数等于乘这个数的倒数;
(2)把
3
4
和10%化为小数;
(3)注意约分;
(4)把1%化为小数;
(5)把
1
2
化为小数; 
(6)把除法改为乘法,再计算; 
(7)先算括号内的,再算括号外的;
(8)按运算顺序,从左向右依次计算;
(9)根据等式的性质,两边先乘9,再减去8即可;
(10)根据比例的基本性质改写成
1
5
X=
1
4
×12,再根据等式的性质,两边同乘5即可;
(11)根据比例的基本性质改写成0.5X=3.2,再根据等式的性质,两边同除以0.5即可;
(12)按运算顺序,先算括号内的,再算括号外的;
(12)用乘法分配律的逆运算简算;
(13)按运算顺序,先算括号内的,再算括号外的;
(14)(15)题按运算顺序,先算括号内的,再算括号外的.
解答:解:(1)6÷
3
4

=6×
4
3

=8;

(2)
3
4
×10%,
=0.75×0.1,
=0.075;

(3)
3
4
×8=6;

(4)15÷1%,
=15÷0.01,
=1500;

(5)1.05-
1
2

=1.05-0.5,
=0.55;

(6)
2
3
÷
3
2

=
2
3
×
2
3

=
4
9


(7)(
1
4
-
1
5
)×
1
20

=
1
20
×
1
20

=
1
400


(8)
3
4
×
5
6
÷
5
6
×
3
4

=
3
4
×
5
6
×
6
5
×
3
4

=
9
16


(9)
8
9
+
1
9
X=2,
8
9
+
1
9
X)×=2×9,
         8+X=18,
       8+X-8=18-8,
           X=10;

(10)X:
1
4
=12:
1
5

        
1
5
X=
1
4
×12,
      
1
5
X×5=
1
4
×12×5,
           X=15;

(11)
3.2
X
=0.5,
       0.5X=3.2,
   0.5X÷0.5=3.2÷0.5,
           X=6.4;

(12)
5
6
÷(1-
9
20
)×
1
5

=
5
6
÷
11
20
×
1
5

=
5
6
×
20
11
×
1
5

=
10
33


(13)
2
5
×
6
11
+40%×
5
11

=
2
5
×(
5
11
+
6
11
),
=
2
5


(14)
9
16
÷(
3
8
+
1
16
),
=
9
16
÷(
6
16
+
1
16
),
=
9
16
×
16
7

=
9
7


(15)(
24
19
+
16
17
)×
1
8
+
15
17

=
24
19
×
1
8
+
16
17
×
1
8
+
15
17

=
3
19
+
2
17
+
15
17

=
3
19
+1,
=1
3
19
点评:此题主要考查学生对四则混合运算顺序的掌握,同时考查了解方程和解比例的能力.
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