谢谢(关于因式分解)2x²+xy-y²-4x+5y-6x²-2x-14(x-y+1)+y(
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谢谢(关于因式分解)
2x²+xy-y²-4x+5y-6
x²-2x-1
4(x-y+1)+y(y-2x)
3x²+5xy-2y²+x+9y-4
x³-3x²+4
2x²+xy-y²-4x+5y-6
x²-2x-1
4(x-y+1)+y(y-2x)
3x²+5xy-2y²+x+9y-4
x³-3x²+4
2x²+xy-y²-4x+5y-6=(2x-y)(x+y)-4x+5y-6=(2x-y+2)(x+y-3)
x²-2x-1=(x-1)²-2=(x-1-√2)(x-1+√2)
4(x-y+1)+y(y-2x)=y²-4y+4+4x-2xy=(y-2)²+2x(y-2)=(2x+y-2)*(y-2)
3x²+5xy-2y²+x+9y-4=(3x-y)(x+2y)+x+9y-4=(3x-y+4)(x+2y-1)
x³-3x²+4=(x+1)(x²-4x+4)=(x+1)(x-2)²
再问: x³-3x²+4=(x+1)(x²-4x+4) =(2x-y)(x+y)-4x+5y-6=(2x-y+2)(x+y-3) =(3x-y)(x+2y)+x+9y-4=(3x-y+4)(x+2y-1) 怎么来的,谢谢
x²-2x-1=(x-1)²-2=(x-1-√2)(x-1+√2)
4(x-y+1)+y(y-2x)=y²-4y+4+4x-2xy=(y-2)²+2x(y-2)=(2x+y-2)*(y-2)
3x²+5xy-2y²+x+9y-4=(3x-y)(x+2y)+x+9y-4=(3x-y+4)(x+2y-1)
x³-3x²+4=(x+1)(x²-4x+4)=(x+1)(x-2)²
再问: x³-3x²+4=(x+1)(x²-4x+4) =(2x-y)(x+y)-4x+5y-6=(2x-y+2)(x+y-3) =(3x-y)(x+2y)+x+9y-4=(3x-y+4)(x+2y-1) 怎么来的,谢谢
谢谢(关于因式分解)2x²+xy-y²-4x+5y-6x²-2x-14(x-y+1)+y(
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