题目内容

解比例
75:
1
2
=12:X
2
15
1
6
=X:
2
3
44.8
8
=
x
6
1
8
2
3
=
1
6
:Χ
(1)75:
1
2
=12:X,
           75x=
1
2
×12,
75x÷75=6÷75,
             x=
2
25


(2)
2
15
1
6
=X:
2
3

        
1
6
x=
2
15
×
2
3

     
1
6
x÷
1
6
=
4
45
÷
1
6

           x=
8
15


(3)
44.8
8
=
x
6

       8x=44.8×6,
    8x÷8=268.8÷8,
        x=33.6;
 
(4)
1
8
2
3
=
1
6
:Χ,
       
1
8
x=
2
3
×
1
6

    
1
8
x÷
1
8
=
1
9
÷
1
8

          x=
8
9
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