(1)1/7(x+14)=1/4(x+20); (2)0.5x−0.10.6=1-0.4−0.7x0.3.

问题描述:

(1)

1
7
(x+14)=
1
4
(x+20);
(2)
0.5x−0.1
0.6
=1-
0.4−0.7x
0.3

(1)去分母得:4(x+14)=7(x+20),
去括号得:4x+56=7x+140,
移项合并得:3x=-84,
解得:x=-28;
(2)方程变形得:

5x−1
6
=1-
4−7x
3

去分母得:5x-1=6-8+14x,
移项合并得:9x=1,
解得:x=
1
9