化简6x平方y加2x y减3方y平方减7x减5yx减4y平方平方减6x平方y
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原式=(x+2Y)(x^2+(2y)^2-2xy)(x-2Y)(x^2+(2y)^2+2xy)=(x^3+(2Y)^3)(x^3-(2Y)^3)=(x^6-(2Y)^6)
∵(x+1)²+|y-2|=0 ∴x+1=0 y-2=0 ∴x=-1 y=2 ∴x²y²+3xy-7x²y²-(5/2)xy+1+5x²
2x^2+3xy=122y^2+3xy=6相减2x^2-2y^2=6x^2-y^2=3(n减2)x的N的绝对值平方家三等于0?
3x^2+2xy+y^2-6x-6y+9=0(x+y)^2-6(x+y)+9=0(x+y-3)^2=0x+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^3y-2x^2y^2+xy^3=x^3y+2x^2y^2+xy^3-4x^2y^2=xy(x^2+2xy+y^2)-4x^2y^2=xy(x+y)^2-4x^2y^2=12×7×7-4×12×12
x²+xy-2y²=0﹙x-y﹚﹙x+2y﹚=0x=y,x=-2y当x=y,﹙x²+3xy+y²﹚/﹙x²+y²﹚=﹙y²+3y&
X2+Y2-4X-6Y+13=0X2-4X+4+Y2-6Y+9=0(X2-4X+4)+(Y2-6Y+9)=0(x-2)2 +(y-3)2=0所以,x-2=0 x=2y-
=(6x³y²-18x²y³+27x^6y³)/(3x²y²)=6x³y²/(3x²y²)
x²y-2x²y²+xy³=xy(x-2xy+y²)出题者估计是X的三次方y减2x的平方y的平方加xy的三次方x³y-2x²y
x²+2xy+4y²+x²y²+1=8xy(x²-4xy+4y²)+(x²y²-2xy+1)=0(x-2y)²
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
-6x²y-3x³-3xy²=-3x(2xy+x²+y²)=-3x(x+y)²
先分解因式,后乘法.(X^4-Y^4)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X+Y)(X^2+Y^2)/(X^3+X^2Y+XY^2+Y^3)=(X-Y)(X^3+X^2Y+XY^2+
x^2+3y^2-12y+12=0x^2+3(y^2-4y+4)=0x^2+(y-2)^2=0所以x=0,y-2=0,y=2y^x=2^0=1
x^2-4xy+4y^2-3x+6y+2=(x-2y)^2-3(x-2y)+2=(x-2y-1)(x-2y-2)
(x的三次方+3x的平方y-5xy的平方+6y三次方+1003)-(2x的三次方-y的三次方-2xy的平方-x的平方y-2)-(4x的平方y+7y的三次方-x的三次方-3xy的平方-1007)(x^3
x3次方减4xy平方减2x平方y加8y三次方=x^2(x-2y)-(2y)^2(x-2y)=(x-2y)(x^2-(2y)^2)=(x+2y)(x-2y)^2
x³-y³-x²y+xy²=(x³-y³)-(x²y-xy²)=(x-y)(x²+xy+y²)-xy
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