分解因式6x方-5x 1=(2x-m)(3x-n),那么m=_,n=__
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x^4-x^3+4x^2+3x+5=(x^4+x^3+x^2)-(2x^3+2x^2+2x)+(5x^2+5x+5)=x^2(x^2+x+1)-2x(x^2+x+1)+5(x^2+x+1)=(x^2-
x³-7x+6=x³-x-6x+6=x(x²-1)-6(x-1)=x(x-1)(x+1)-6(x-1)=(x-1)[x(x+1)-6]=(x-1)(x²+x-6
原式=(x^4+2x³+x²)+(5x²+10x+5)=x²(x+1)²+5(x+1)²=(x+1)²(x²+5)
2x四次方-x三次方-6x平方-x+2=(x-2)(x+1)^2(2x-1)再问:要用换元法啊啊啊啊,否则别乱答啊~!再答:啊?换元法?我只记得我用它解过方程呢?什么时候因式分解可以用换元法?再问:你
x³-4x²y=x²(x-4y)x的四次方-5x²+4=(x²-4)(x²-1)=(x+2)(x-2)(x+1)(x-1)6x²+
x(x^2-3)=x(x+√3)(x-√3)(√2x+√5)(√2x-√5)
(⊙o⊙)…?
x^2+3xy+2y^2+4x+5y+3=(x+y)(x+2y)+3(x+y)+(x+2y)+3=(x+y)(x+2y+3)+(x+2y+3)=(x+y+1)(x+2y+3)
2x四次方+x三次方-20x平方-13x+30有因式2x+5和x-3设2x四次方+x三次方-20x平方-13x+30=(2x+5)(x-3)(x^2+ax+b)2x四次方+x三次方-20x平方-13x
2x四次方-x三次方-6x平方-x+2=(x-2)(x+1)^2(2x-1)
原式=2x(x²+3x+2)=2x(x+1)(x+2)
再问:再答:等于7-x
-x²+2x+15=0-1513-x²+2x+15=0(-x+5)(x+3)=0x1=5x2=-3再问:-x²+2x+15=0-1 51
x^4-x³-5x²-6x-4x^4-x^3-5x^2-6x-4 =(x^2+ax+b)(x^2+cx+d) =x^4+(a+c)x^3+(ac+b+d)x^2+(ad+bc)
x^2+xy-2y^2+x+5y-2=(x^2+xy-2y^2)+x+5y-2=(x+2y)(x-y)-(x-y)+2(x+2y)-2=(x-y)[(x+2y)-1]-2[(x+2y)-1]=(x-y
2X^2+xy-Y^2-4x+5Y-6=(2x-Y)(x+Y)-4x+5y-6=(2x-Y+a)(x+y+b)恒成立,可解得a=2,b=-3.所以2X^2+xy-Y^2-4x+5Y-6=(2x-Y+2
x²-2x三次方+x=-x(2x²-x-1)=-x(2x+1)(x-1)
x的四次方-5x²-36=(x²-9)(x²+4)=(x+3)(x-3)(x+2)(x-2)
题目有误,应为分解因式:2x方+xy-y方-4x+3y-6=(2x-y-2)(x+y-3)十字相乘法2-1-211-3
2x^2+xy-y^2-4x+5y-6双十字相乘法,2x^2+xy-y^2-4x+5y-62x-y2xy-3(2x-y+2)(x+y-3)或者待定系数法.有问题追问再问:谢谢谢谢谢谢谢你再答:不用谢