问题 解答题
解方程.
5
6
=
4
5
5X-4.7X=
9
10
2
3
X+8=122
5
6
÷X=
15
16
5
12
=
4
5
11
13
×X=
12
13
答案

(1)x÷

5
6
=
4
5

      x÷

5
6
×
5
6
=
4
5
×
5
6

           x=

2
3

(2)5x-4.7x=

9
10

        0.3x=

9
10

   0.3x÷0.3=

9
10
÷0.3,

           x=3;

(3)

2
3
x+8=122,

  

2
3
x+8-8=122-8,

    

2
3
x÷
2
3
=114÷
2
3

        x=171;

(4)

5
6
÷x=
15
16

 

5
6
÷x×x=
15
16
×x,

  

5
6
÷
15
16
=
15
16
x÷
15
16

        x=

8
9

(5)x÷

5
12
=
4
5

 x÷

5
12
×
5
12
=
4
5
×
5
12

         x=

1
3

(6)

11
13
×x=
12
13

 

11
13
×x÷
11
13
=
12
13
÷
11
13

         x=1

1
11

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