求下列方程的解. ①2(2-x)+3(4x-2)=7(x+4) ②1/3x+5/6=3/4+x.

问题描述:

求下列方程的解.
①2(2-x)+3(4x-2)=7(x+4)

1
3
x+
5
6
=
3
4
+x.

①2(2-x)+3(4x-2)=7(x+4)
              4-2x+12x-6=7x+28,
               12x-2x-7x=28-4+6,
             (12-2-7)x=30,
                      3x=30,
                   3x÷3=30÷3
                       x=10;

1
3
x+
5
6
=
3
4
+x
  
5
6
-
3
4
=x-
1
3
x,
    
1
12
=(1-
1
3
)x,
    
1
12
=
2
3
x,
 
1
12
÷
2
3
=
2
3
2
3

       x=
1
8