解方程:(1)2x+5=3(x-1)(2)x?23=x+12 (3)1-x?43=x+32 (4)x?20.2-x+12=3.

2024-12-16 17:41:46
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回答1:

(1)2x+5=3(x-1),
去括号得:2x+5=3x-3,
移项合并得:x=8;
(2)去分母得:2(x-2)=3(x+1),
去括号得:2x-4=3x+3,
移项合并得:x=7;
(3)去分母得:6-2x+8=3x+9,
移项合并得:5x=5,
解得:x=1;
(4)方程变形得:

10x?20
2
-
x+1
2
=3,
去分母得:10x-20-x-1=6,
移项合并得:9x=27,
解得:x=3.