.因式分解x2(x-y)+y2(y-x)=
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(x2+2x+1)-y2,=(x+1)2-y2,=(x+y+1)(x-y+1).
2x"+xy-y"-5x+4y-3=2x"+2xy-xy-y"-6x+x+y+3y-3=2x(x+y)-y(x+y)+(x+y)-6x+3y-3=(x+y)(2x-y+1)-3(2x-y+1)=(x+
25(x²+2xy+y²)-9(x²-2xy+y²)=[5(x+y)]²-[3(x-y)]²=[5(x+y)+3(x-y)][5(x+y)-
x²+y-xy-x=﹙x²-xy﹚+﹙y-x﹚=x﹙x-y﹚-﹙x-y﹚=﹙x-y﹚﹙x-1﹚
1.x^3-5x+4=x^3-x^2+x^2-x-4x+4=(x-1)(x^2+x-4)2(y^2-3y-2)(y^2-3y+4)-16=(y^2-3y)^2+2(y^2-3y)-24=(y^2-3y
x2-y2-z2-2yz+1-2x=x^2-2x+1-(y^2+2yz+z^2)=(x-1)^2-(y+z)^2=(x-1+y+z)(x-1-y-z)=(x+y+z-1)(x-y-z-1)x2-6xy
如果你的X2是x的平方,X3是x的三次方那么答案是:-(x-y+z)*(x-y-z)*(x+y-z)
x^2+xy-2y^2-x+7y-6=(x+2y)(x-y)-x+7y-6x+2y-3Xx-y2十字相乘得:2(x+2y)-3(x-y)=-x+7y是一次项所以原式=(x+2y-3)(x-y+2)
先展开重点是完全立方公式解题时常用它的变形:(a+b)^3; = a^3 + b^3+ 3ab(a+b)
x2+2xy+y2+4x+4y+4=(x+y)2+4(x+y)+4=(x+y+2)2.故答案为:(x+y+2)2.
9x2-y2-4y-4,=9x2-(y2+4y+4),=9x2-(y+2)2,=(3x+y+2)(3x-y-2).
(x2+8x+16)-16y2=(x+4)^2-(4y)^2=(x+4+4y)(x+4-4y)
x3+(y-1)x2-2xy-y2=x^3+x^2y-x^2-2xy-y^2=x^2(x+y)-(x+y)^2=(x+y)(x^2-x-y)
原式=(x-y)-(x2-y2)=(x-y)-(x+y)(x-y)=(x-y)(1-x-y),故答案为:(x-y)(1-x-y).
解题思路:根据整式的运算法则进行计算.解题过程:解
题目可能是2x2-3xy+y2+5x-y-12吧!2x2-3xy+y2+5x-y-12=(2x-y-3)(x-y+4)
x²-xy-y²=x²-xy+y²/4-5y²/4=(x-y/2)²-5y²/4=[x+(√5-1)y][x-(√5+1)y]
2x²+xy-3y²+x+4y-1=2×x×x+x×y-3×y×y+x+4×y-1=x×2x+x×y-y×3y+x×1+y×4-1=x×(2x+y+1)-y×(3y+4)-1再问:
首先,X^2-XY+2Y^2=(X-2Y)(X+Y)所以,设x^2-xy-2y^2-x+5y-2可分解成(X-2Y+A)(X+Y+B)则展开有X的一次项=A+B=-1Y的一次项有A-2B=5连列成方程
1.原式=(x+1)^2-y^2=(x+1+y)(x+1-y)2.公因式为(x-2)3.原式=16-(16x^2-8xy+y^2)=16-(4x-y)^2=(4+4x+y)(4-4x+y)或(-4+4