x²-4x y²-6y 13因式分解-搜答案-大师作文网

：-x²-4y²+4xy=-(x²+4y²-4xy)=-(x-2y)²施主,我看你骨骼清奇,器宇轩昂,且有慧根,乃是万中无一的武林奇才.潜心修习,将来

原式=x²-6xy+9y²-14y²=(x-3y)²-14y²=(x-3y+√14y)(x-3y-√14y)

x^2-xy-2y^2-x-y=(x^2-xy-2y^2)-(x+y)=(x-2y)(x+y)-(x+y)=(x+y)(x-2y-1)

2x^2+4xy=2x(x+2y)4x^2-12xy=2*2x(x-3y)多项式2x^2+4xy与4x^2-12xy的公因式为_2x____

（1-x^2)(1-y^2)+4xy=1-x²-y²+x²y²+4xy=（x²y²+2xy+1）-（x²-2xy+y²）

2x^2+xy-y^2-4x+5y-6=(2x-y)(x+y)-4x+5y-6=(2x-y)(x+y)+(2x+2y)-6x+3y-6=(2x-y)(x+y)+2(x+y)-6x+3y-6=(x+y)

4xy平方一4x平方y一y三次方因式分欿提取公因式y得y（4xy-4x^2-y^2）=-y（-4xy+4x^2+y^2）=-y（2x-y）^2您好,很高兴为您解答,hua395288466您答疑解惑如

2x^2+xy-y^2-4x+5y-6=(2x-y)(x+y)-4x+5y-6=(2x-y)(x+y)+(2x+2y)-6x+3y-6=(2x-y)(x+y)+2(x+y)-6x+3y-6=(x+y)

第二题用图像法画出直角坐标系x^2+y^2=25表示圆心在原点半径是5的圆2x+3y=17是一直线直线和圆的两个交点就是方程的解求两个交点的坐标直接在图上用几何解就行了

4x^2-12xy+9y^2-2x+3y-6=(4x^2-12xy+9y^2)-(2x-3y）-6=（2x-3y）^2-(2x-3y)-6=(2x-3y+2)(2x-3y-3)

=7x²-4x²+4xy-y²=7x²-(2x-y)²=(√7x+2x-y)(√7x-2x+y)本题答案不唯一的

2X²+XY-6Y²=0(2x-3y)(x+2y)=02x-3y=0或x+2y=0x=3/2y或x=-2y

12x^2+xy-6y^2=(4x+3y)(3x-2y)

x^3+3x-4=x^3+(x^2-x^2)+(4x-x)-4=x^3+x^2+4x-x^2-x-4=(x^2+x+4)x-(x^2+x+4)=(x^2+x+4)(x-1)4x^2+2x-y-y^2=

2x2+xy-y2-4x+5y-6=（x+y）（2x-y）-4x+5y-6=（x+y）（2x-y）+2（x+y）-6x+3y-6=（x+y）（2x-y+2）-3（2x-y+2）=（2x-y+2）（x+

4x³-xy²=x(4x²-y²)=x[(2x)²-y²]=x(2x+y)(2x-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

3x²-6xy-3y=3(x²-2xy-y)你的题目是不是错了啊,估计是3x²-6xy+3y²3x²-6xy+3y²=3(x²-2

6x³y（x-y)³-4xy³(y-x)²＝6x³y（x-y)³-4xy³(x-y)²=2xy(x-y)²[3

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