问题 解答题
求未知数X.
3
10
=
3
100
   
X-0.8X-6=16    
X:
1
2
=
2
5
7
8
答案

(1)x÷

3
10
=
3
100

3
10
×
3
10
=
3
100
×
3
10

x=

9
1000

(2)x-0.8x-6=16,

0.2x=22,

0.2x÷0.2=22÷0.2,

x=110;

(3)x:

1
2
=
2
5
7
8

7
8
x=
2
5
×
1
2

7
8
x=
1
5

7
8
7
8
=
1
5
÷
7
8

x=

8
35

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