问题
解答题
解下列方程:
(1)2x+3-2x+1=48
(2)2x(x-1)-(x+1)(x-2)=x(x+2)-4.
答案
(1)2x+3-2x+1=48,
2x+1(22-1)=48,即2x+1=16=24,
可得:x+1=4,
解得:x=3;
(2)2x(x-1)-(x+1)(x-2)=x(x+2)-4,
2x2-2x-(x2-x-2)=x2+2x-4,
2x2-2x-x2+x-x2-2x=-2-4,
-3x=-6,
解得:x=2.