问题 解答题
求未知数X:
2X-
1
2
=0.5                  
X+
5
4
X=
27
16

2:(1-X)=
4
5
   
0.36:X=
1
10
4
9
答案

(1)2x-

1
2
=0.5,

    2x-

1
2
+
1
2
=0.5+
1
2

         2x÷2=1÷2,

             x=0.5 

(2)x+

5
4
x=
27
16

      

9
4
x=
27
16

 

9
4
4
9
=
27
16
×
4
9

         x=

3
4

(3 )2:(1-x)=

4
5

      4×(1-x)=2×5,

   4×(1-x)÷4=10÷4,

           1-x+x=

5
2
+x,

         

5
2
+x=1,

     

5
2
+x-
5
2
=1-
5
2

               x=-

3
2

(4)0.36:x=

1
10
4
9

       

1
10
x=0.36×
4
9

   

1
10
x×10=0.16×10,

           x=1.6.

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