题目内容

8χ÷
1
2
=
3
5
Χ
20
=
1
8
÷
1
4
χ:4=0.2:10%
5
6
Χ=
2
3
3
10
(1)8x÷
1
2
=
3
5

      8x÷
1
2
×
1
2
=
3
5
×
1
2

             8x=
3
10

          8x÷8=
3
10
÷8,
              x=
3
80


(2)
x
20
=
1
8
÷
1
4

    
x
20
=
1
2

      2x=20×1,
   2x÷2=20÷2,
       x=10;

(3)x:4=0.2:10%
     10%x=4×0.2,
10%x÷10%=4×0.2÷10%,
        x=8;

(4)
5
6
Χ=
2
3
3
10

        
2
3
x=
5
6
×
3
10

    
2
3
3
2
=
1
4
×
3
2

         x=
3
8
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