题目内容

求未知数x.
(1)
3
4
x-
3
8
×4=
3
4
                         
(2)4:
3
5
=x:
5
8

(3)3x-
2
5
=
3
5

(4)6×1.5+5x=12.
(1)
3
4
x-
3
8
×4=
3
4

           
3
4
x-
3
2
+
3
2
=
3
4
+
3
2

              
3
4
x÷
3
4
=
9
4
÷
3
4

                    x=3;

(2)4:
3
5
=x:
5
8

        
3
5
x=4×
5
8

     
3
5
x÷
3
5
=
5
2
÷
3
5

           x=4
1
6


(3)3x-
2
5
=
3
5

  3x-
2
5
+
2
5
=
3
5
+
2
5

     3x÷3=1÷3,
         x=
1
3


(4)6×1.5+5x=12,
        9+5x-9=12-9,
         5x÷5=3÷5,
             x=0.6.
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