(x加y)的二次方减6(x加y)加9因式分解
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x^2y^2-4xy+x^2+y^2+1=(xy)^2-2xy+1+x^2-2xy+y^2=(xy-1)+(x-y)^2=0xy-1=0,x-y=0,x^2=y^2=1,x=y=1或x=y=-1x+y
x=7,y=-1
由(1)x²-xy=5(2)y²+xy=-2∴(1)+(2)得:x²+y²=3.
x³-y³=(x-y)(x²+xy+y²)所以是乘x-y
先配方得(x+1)^2-(y-3)^2=0,再用平方差公式得(x+y-2)(x-y+4)=0.须知两个因数相乘得零的话这两个因数至少有一个为零.x+y不等于2即前一个因数不为零,即x-y+4=0,即x
X²+4X+Y²-6Y+13=0X²+4X+4+Y²-6Y+9=0(X+2)²+(Y-3)²=0X=-2,Y=3
X2-4X+Y2+6Y+13=0(X-2)2+(Y+3)2=0∴有X-2=0,X=2Y+3=0,Y=-3
x^2+y^2-4x-10y+29=0x^2-4x+4+y^2-10y+25=0(x-2)^2+(y-5)^2=0x=2y=5x^y+xy^2=xy(x+y)=2*5(2+5)=70
(x加y加z)的二次方减(x加y加z)的二次方=(x+y+z+x+y+z)(x+y+z-x-y-z)=0你抄错了吧再问:再答:(x加y加z)的二次方减(x加y-z)的二次方=(x+y+z+x+y-z)
x/y=3x=3y原式=[(3y)²+2*3y*y-3y²]/[(3y)²-3y*y+y²]=(9y²+6y²-3y²)/(9y&
已知x=二分之一,xy(y加y的二次方)减y的二次方(xy-x)+2x(x-y的平方)的值=xy²+xy³-xy³+xy²+2x²-2xy²
解题思路:考查多项式的运算解题过程:解:因为2x2+my-12与nx2-3y+6的和中不含x,y所以n=-2,m=3所以mn=-6祝你取得优异成绩!加油!最终答案:略
7x^3-6x^3y+3x^2y+3x^3+6x^3y-3x^2y-10x^3,其中x=-2010.y=2012=(7x^3+3x^3-10x^3)+(6x^3y-6x^3y)+(3x^2y-3x^2
x二次方加y的二次方减6x加4y加13的平方根等于零x^2+y^2-6x+4y+13=0x^2-6x+9+y^2+4y+4=0(x-3)^2+(y+2)^2=0x-3=0,y+2=0x=3,y=-2x
x=2y=1
原式=[x/(x-y)]*[y^2/(x+y)]-[x^4y/(x^2+y^2)(x^2-y^2)]/[x^2/(x^2+y^2)]=xy^2/(x^2-y^2)-x^2y/(x^2-y^2)=xy(
x³y³-2x²y²+xy=xy(x²y²-2xy+1)=xy(xy-1)²
再问:不清楚再答:字不清楚or看不懂再问:都再答:平方差公式啊,学了吧再问:嗯再答:再问:谢了
=x/2-(x-2y^2)+(-3x+y^2)=x/2-x+2y^2-3x+y^2=3y^2-7/2x