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)=01:_数学解答

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)=0
1:（x-1）2+2x（x-1）=0
2:2x2-4x-5=0
3:-3x2-4x+4=0
4:2(y+4)2+y(y+4)=0

人气：138 ℃　时间：2020-02-05 05:22:24

解答

1.（x-1）^2+2x（x-1）=0x^2-2x+1+2x^2-2x=03x^2-4x+1=0(3x-1)(x-1)=0x1=1/3 x2=12.2x^2-4x-5=0 x^2-2x+1=3.5x-1=土√3.5x1=1+√3.5 x2=1-√3.53.-3x^2-4x+4=03x^2+4x-4=0(3x-2)(x+2)=0x1=2/3 x2=-2 4.2(y+4)^2+y(y+...