解方程:(1)x 2 +4x+1=0 (2)(x-1) 2 +2x(x-1)=0
解方程:(1)x2+4x+1=0(2)(x-1)2+2x(x-1)=0....
解方程:(1)x 2 +4x+1=0 (2)(x-1) 2 +2x(x-1)=0.
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小楠哥0532
2014-08-24
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(1)x 2 +4x=1, x 2 +4x+4=5, (x+2) 2 =5 x+2=± , 所以x 1 =-2+ ,x 2 =-2- ;
(2)(x-1)(x-1+2x)=0, x-1=0或x-1+2x=0, 所以x 1 =1,x 2 = . |
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