解比例.45:54=60:X 3:2.5=X:40 35:67...

解比例.45:54=60:X 3:2.5=X:40 35:67=X:54 4024=5X 6.5:x=3.25:4 23:56=X:9.

(1)45:54=60:x,
           45x=54×60,
       45x÷45=3240÷45,
             x=72;

(2)3:2.5=x:40,
       2.5x=3×40,
  2.5x÷2.5=120÷2.5,
          x=48;

(3)
3
5
6
7
=x:
5
4

      
6
7
x=
3
5
×
5
4

    
6
7
x÷
6
7
=
3
4
÷
6
7

        x=
7
8


(4)
40
24
=
5
X

    40x=24×5,
40x÷40=120÷40,
      x=3;

(5)6.5:x=3.25:4,
      3.25x=6.5×4,
3.25x÷3.25=26÷3.25,
          x=8;

(6)
2
3
5
6
=x:9,
      
5
6
x=
2
3
×
9,
   
5
6
x÷
5
6
=6÷
5
6

        x=7.2.
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