解下列方程(1)(x-2)2-4=0 (2)x2-4x=0(3)2(x-3)2=x(x-3)(4)x2-2x-4=0
解下列方程(1)(x-2)2-4=0(2)x2-4x=0(3)2(x-3)2=x(x-3)(4)x2-2x-4=0....
解下列方程 (1)(x-2)2-4=0 (2)x2-4x=0 (3)2(x-3)2=x(x-3) (4)x2-2x-4=0.
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(1)(x-2)2=4,
两边同时平方得出:x-2=±2,
则:x-2=2,x-2=-2,
解得:x1=4,x2=0;
(2)x2-4x=0
x(x-4)=0,
则:x=0,x-4=0,
解得:x1=0,x2=4;
(3)2(x-3)2=x(x-3),
2(x-3)2-x(x-3)=0,
(x-3)(x-6)=0,
则:x-3=0,x-6=0,
解得:x1=3,x2=6;
(4)x2-2x-4=0,
x2-2x+1=4,
(x-1)2=4,
x-1=±2,
则:x-1=2,x-1=-2,
解得:x1=3,x2=-1.
两边同时平方得出:x-2=±2,
则:x-2=2,x-2=-2,
解得:x1=4,x2=0;
(2)x2-4x=0
x(x-4)=0,
则:x=0,x-4=0,
解得:x1=0,x2=4;
(3)2(x-3)2=x(x-3),
2(x-3)2-x(x-3)=0,
(x-3)(x-6)=0,
则:x-3=0,x-6=0,
解得:x1=3,x2=6;
(4)x2-2x-4=0,
x2-2x+1=4,
(x-1)2=4,
x-1=±2,
则:x-1=2,x-1=-2,
解得:x1=3,x2=-1.
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