y=x三次方-2x平方-x 2图像-搜答案-智慧作业帮

原式=2xy(x²+2xy+y²)=2xy(x+y)²=2*2*4²=64

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

a(x的3m次方y12次方)÷(9x的4次方y的2n次方)=2x五次方y四次方(a/9)(x的3m-4次方y的12-2n次方)=2x五次方y四次方所以a/9=23m-4=512-2n=4所以a=18m

原式化简：(2x^3-3x^2y-2xy^2)-(x^3-2xy^2+y^3)+(-x^3+3x^2y-y^3)=2x^3-3x^2y-2xy^2-x^3+2xy^2-y^3-x^3+3x^2y-y^

x³y³—2x²y²+xy=xy(x²y²-2xy+1)=xy[(xy)²-2xy+1]=xy(xy-1)²

由ly-2l+(x-1)的平方=0得y-2=0,x-1=0；则y=2,x=1；x的三次方-x的平方y+x乘y的平方+x的平方y-x乘y的平方-y的三次方=1-8=-7

x-y=2两边同时平方又x^2+y^2=12所以xy=4原式=xy(x^2-2xy+y^2)=xy(x-y)^2=16

=xy(x²-2xy+y²)=xy(x-y)²=2*1²=2

x³y-2x²y+xy=xy(x²-2x+1)=xy(x-y)²=1/2×2²=2

3(x-2y)-x²y(2y-x)=3(x-2y)+x²y(x-2y)=(x-2y)(3+x²y)

x²+y³-2=142x²+y³=142+2=144

上式化简的最终结果是-2y的平方,也就是与x无关,所以无论x取几,答案都一样为2

y=2x^3-6x^2-18x+7y'=6x^2-12x-18=06(x^2-2x-3)=0x^2-2x-3=0(x-3)(x+1)=0x=3,-1y=(-1)=17------->maximumy=

原式=x^3+2x^2y+xy^2 =x(x^2+2xy+y^2) =x(x+y)^2再问：x-2��֮x-

y=x³/(x²+2x-3)=x³/(x-1)(x+3)当x→1或x→-3时,y→∞.因此x=1与x=-3都是此曲线的垂直渐近线.当x→+∞或x→-∞时,分别有y→+∞和

-x三次方y-2x平方y平方-xy三次方=-xy(x²+2xy+y²)=-xy(x+y)²

x³y-2x²y+xy=xy(x²-2x+1)=xy(x-y)²

2x³-8x²y+8xy²=2x(x²-4xy+4y²)=2x(x-2y)²

（2x²y负三次方）²×（-3x负一次方y²)³=4x^4y^(-6)[-27x^(-3)y^6]=-108x注^后是指数

(3x分之y)的平方×(-y分之x)的三次方÷(-x分之2y)方=(y²/9x²)(-x³/y³)(x²/4y²)=-x³/36y