题目内容

解比例
0.6:4.8=12:X
2
3
1
4
=1.2:X
45:X=18:26
9:0.09=X:0.15 x:
1
20
=
3
4
1
5
(3.8-x):7=2:7
0.8
X
=
7
5
x:
5
7
=0.3:
5
14
1.6
6
=
X
2.4
0.375:X=
1
20
:60%
X:5=
18
30
1
2
1.4
x
=
0.4
15
2
5
:X=0.25:6
0.45:X=
2
7
:20
1.25:0.25=X:1.6
X:48=3:1.2
7
8
:X=1:0.25
1.6
X
=
2.5
5
12:5=3.6:X X:0.25=4:3 1.5:X=3.6:4.8
6.5:X=3
1
4
:4
0.6:1
1
5
=
4
5
:X
1.5:
3
4
=0.36:X
0.75:X=1
1
4
:2
3.6:X=0.48:
3
25
1.25:0.2=X:1
3
5
分析:先根据比例基本性质,两内项之积等于两外项之积,化简方程,再依据等式的性质,求解.
解答:解:(1)0.6:4.8=12:X,
             0.6X=4.8×12,
        0.6X÷0.6=57.6÷0.6,
                X=96;

(2)
2
3
1
4
=1.2:X,
      
2
3
X=
1
4
×1.2,
    
2
3
2
3
=0.3÷
2
3

        X=0.45;

(3)45:X=18:26,
       18X=45×26,
   18X÷18=1170÷18,
         X=65;

(4)9:0.09=X:0.15,
       0.09X=0.15×9,
 0.09X÷0.09=1.35÷0.09,
           X=15;

(5)x:
1
20
=
3
4
1
5

    
1
5
x:=
1
20
×
3
4

   
1
5
x÷
1
5
=
3
80
÷
1
5

        x=
3
16


(6)(3.8-x):7=2:7,
     (3.8-x)×7=2×7,
  (3.8-x)×7÷7=14÷7,
           3.8-x=2,
         3.8-x+x=2+x,
             3.8=2+x,
           3.8-2=2+x-2,
               x=1.8;

(7)
0.8
X
=
7
5

      7X=0.8×5,
   7X÷7=4÷7,
       X=
4
7


(8)x:
5
7
=0.3:
5
14

     
5
14
x=
5
7
×0.3,
  
5
14
x÷
5
14
=
3
14
÷
5
14

         x=
3
5


(9)
1.6
6
=
X
2.4

       6X=1.6×2.4,
    6X÷6=3.84÷6,
        X=0.64;

(10)0.375:X=
1
20
:60%,
         
1
20
X=0.375×60%,
     
1
20
X÷
1
20
=
9
40
÷
1
20

            X=
9
2


(11)X:5=
18
30
1
2

      
1
2
X=5×
18
30

   
1
2
X÷
1
2
=3÷
1
2

        X=6;

(12)
1.4
x
=
0.4
15

      0.4x=1.4×15,
 0.4x÷0.4=21÷0.4,
         x=52.5;

(13)
2
5
:X=0.25:6,
      0.25X=
2
5
×6,
0.25X÷0.25=2.4÷0.25,
          X=9.6;

(14)0.45:X=
2
7
:20,
         
2
7
X=0.45×20,
      
2
7
X÷
2
7
=9÷
2
7

           X=31.5;

(15)1.25:0.25=X:1.6,
           0.25X=1.25×1.6,
     0.25X÷0.25=2÷0.25,
               X=8;

(16)X:48=3:1.2,
      1.2X=48×3,
 1.2X÷1.2=144÷1.2,
         X=120;

(17)
7
8
:X=1:0.25,
         X=0.25×
7
8

         X=
7
32


(18)
1.6
X
=
2.5
5

      2.5X=1.6×5,
 2.5X÷2.5=8÷2.5,
         X=3.2;

(19)12:5=3.6:X,
       12X=5×3.6,
   12X÷12=18÷12,
         X=1.5;

(20)X:0.25=4:3,
          3X=0.25×4,
       3X÷3=1÷3,
           X=
1
3


(21)1.5:X=3.6:4.8,
        3.6X=1.5×4.8,
   3.6X÷3.6=7.2÷3.6,
           X=2;

(22)6.5:X=3
1
4
:4,
        3
1
4
X=4×6.5,
    3
1
4
X÷3
1
4
=26÷3
1
4

          X=8;

(23)0.6:1
1
5
=
4
5
:X,
         0.6X=1
1
5
×
4
5

    0.6X÷0.6=
24
25
÷0.6

            X=
8
5


(24)1.5:
3
4
=0.36:X,
        1.5X=
3
4
×0.36,
   1.5X÷1.5=0.27÷1.5,
           X=0.18;

(25)0.75:X=1
1
4
:2,
         1
1
4
X=2×0.75,
     1
1
4
X÷1
1
4
=1.5÷1
1
4

           X=1.2;

(26)3.6:X=0.48:
3
25

       0.48X=3.6×
3
25

 0.48X÷0.48=0.432÷0.48,
           X=0.9;

(27)1.25:0.2=X:1
3
5

           0.2X=1.25×1
3
5

      0.2X÷0.2=2÷0.2,
              X=10;
点评:本题主要考查学生运用等式的性质,以及比例基本性质解方程的能力,注意等号对齐.
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