解比例.0.6:x=34

解比例.0.6:x=34:14 0.499.8=16x 34:1112=x:120 0.4:x=(1+17):5 (x+7):6=7:21.

(1)0.6:x=
3
4
1
4

          
3
4
x=0.6×
1
4

          
3
4
x=0.15,
      
3
4
3
4
=0.15÷
3
4

             x=0.2;

(2)
0.49
9.8
16
x

      0.49x=16×9.8,
      0.49x=156.8,
0.49x÷0.49=156.8÷0.49,
          x=320;

(3)
3
4
11
12
=x:
1
20

         
11
12
x=
3
4
×
1
20

         
11
12
x=
3
80

    
11
12
11
12
=
3
80
÷
11
12

             x=
9
220


(4)0.4:x=(1+
1
7
):5

     (1+
1
7
)x=0.4×5,
          
8
7
x=2,
       
8
7
8
7
=2÷<
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