解方程.(1)2x-8.125=18.125  (2)3x+ 13 9 = 14 9 (3)x+ 5 9

解方程.(1)2x-8.125=18.125  (2)3x+ 13 9 = 14 9 (3)x+ 5 9 =1 (4)2x- 5 6 = 5 6 (5)x-( 3 14 + 4 7 )= 1 2 (6)x-( 7 4 - 3 8 )= 7 8 .

(1)2x-8.125=18.125,
2x-8.125+8.125=18.125+8.125,
2x÷2=26.25÷2,
x=13.125;

(2)3x+
13
9
=
14
9

3x+
13
9
-
13
9
=
14
9
-
13
9

3x÷3=
1
9
÷3,
x=
1
27


(3)x+
5
9
=1,
x+
5
9
-
5
9
=1-
5
9

x=
4
9


(4)2x -
5
6
=
5
6

2x -
5
6
+
5
6
=
5
6
+
5
6

2x ÷2=
10
6
÷2

x=
5
6


(5)x- (
3
14
+
4
7
)=
1
2

x-
11
14
=
1
2

x-
11
14
+
11
14
=
1
2
+
11
14

x= 1
2
7


(6)x- (
7
4
-
3
8
)=
7
8

x-
11
8
=
7
8

x -
11
8
+
11
8
=
7
8
+
11
8

x= 2
1
4
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