马上就要答案,（x-1）2+2x（x-1）=0 2 - 知识问答

马上就要答案,（x-1）2+2x（x-1）=0 2x2-4x-5=0 -3x2-4x+4=0 2(y+4)2+y(y+4

3个回答

1.（x-1）^2+2x（x-1）=0
x^2-2x+1+2x^2-2x=0
3x^2-4x+1=0
(3x-1)(x-1)=0
x1=1/3 x2=1
2.2x^2-4x-5=0
x^2-2x+1=3.5
x-1=土√3.5
x1=1+√3.5 x2=1-√3.5
3.-3x^2-4x+4=0
3x^2+4x-4=0
(3x-2)(x+2)=0
x1=2/3 x2=-2
4.2(y+4)^2+y(y+4)=0
2(y+4)+y=0
2y+8+y=0
y=-8/3 .

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