解方程: (1)x+3/4=7/8 (2)11/12−x=5/6 (3)x−4/7=2 (4)x−3/5=1−3/5.

问题描述:

解方程:
(1)x+

3
4
7
8

(2)
11
12
−x=
5
6

(3)x−
4
7
=2

(4)x−
3
5
=1−
3
5

(1)x+

3
4
7
8

       x+
3
4
3
4
=
7
8
-
3
4

            x=
1
8
         
(2)
11
12
−x=
5
6

    
11
12
-x+x=
5
6
+x
     
5
6
+x-
5
6
=
11
12
5
6

           x=
1
12

(3)x−
4
7
=2

    x-
4
7
+
4
7
=2+
4
7

         x=2
4
7

(4)x−
3
5
=1−
3
5

       x-
3
5
=
2
5

     x-
3
5
+
3
5
=
2
5
+
3
5

          x=1.