(x-2y)的立方-搜答案-智慧作业帮

[3a^3/(x+y)]^3*(x^2-y^2)/[(y-x)/(x+y)]^2=27a^9/(x+y)^3*(x+y)*(x-y)*(x+y)^2/(x-y)^2=27a^9/(x-y)

原式=x³+3x²y-5xy²+6y³+1-2x³+y³+2xy²+x²y+2-4x²y-7y³+x

（-x的立方+3x的平方y-y的立方）-（x的立方-2xy的平方+y的立方）+（2x的立方-2x的平方y-2xy的平方）=-x^3+3x^2y-y^3-x^3+2xy^2-y^3+2x^3-2x^2y

(5x³-7x³y+3x²y)+2x³-(-7x³y+3x²y+7x³)=(5x³+2x³-7x³)

(x³-3x²y+2y³)-(-2x³+4x²y+5y³)=x³-3x²y+2y³+2x³-4x&#

解(2x³-2x²y-2xy²)-(x³-2xy²+y³)+(-x³+2x²y-y³)=(2x³-x

x^3y^3-(1/2)x^y+y^-2x^3y^3+0.5x^+y^+x^3y^3-2y^-3=(1-2+1)x^3y^3-(1/2)x^y+0.5x^+(1+1-2)y^-3=-(1/2)x^y+

（x+y）的立方+2xy（1-x-y）-1=(x+y-1)[(x+y)²+(x+y)+1]-2xy(x+y-1)=(x+y-1)(x²+2xy+y²+x+y+1-2xy)

楼主你或许被这么多的xyz和立方吓住了,“（x+1）的平方+|y-1|+|z|=0”才是解题关键,三项都不小于0但加和为0,则x=-1,y=1,z=0,再代入ABC,求得A=-2,B=2,C=3,则A

=x+y的立方乘以（2倍的x+y）的立方乘以（3倍的x+y）的立方=a³乘以（2a）³乘以（3a）³=a³乘以8a³乘以27a³=8a的六次

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

再问：最后一个是y的平方你写错了再问：最后一个是y的平方你写错了再答：你的题目打的是立方？？？

(x+y+z)³-x³-y³-z³=（y+z)[(x+y+z)²+x(x+y+z)+x²]-(y+z)(y²-yz+z²

(-3xy)立方*2x立方/(-3x平方y)=-27x^3y^3*2x^3/(-3x^2y)=18x^4y^2

原式=4q(1-q)³+2(1-p)²=2(1-p)²[2(1-p)+1]=2(1-p)²(3-2p)原式=(x-y）⁴+x(x-y)³-

8x的4次方y+6x的立方y的立方-2x的立方y=2x³y(4x+3y²-1)

088t67

32x的立方y的四次方-2x的立方=2x³（16y∧4-1）=2x³（4y²+1）（4y²-1）=2x³（4y²+1）（2y+1)(2y-1

(X-y)的平方=1=x方+y方-2xyx2+y2=4所以2xy=3xy=2/3x立方*y立方=（xy）立方=8/27(x+Y)的平方=X方+Y方+2XY=4+2/3=4又2/3

y的立方分之x的平方y÷-x分之2y=y的立方分之x的平方yX-2y分之x=-2y的立方分之x的立方