已知一列分式y分之2x的三次方-搜答案-搜搜做题作业网

A-B=x³+2y³-xy²-(-y³+x³+2xy²)=x³+2y³-xy²+y³-x³

x+y=1两边平方x²+2xy+y²=1xy=3/16x²-2xy+y²=1-4xy=1/4x的三次方y-2x的平方y的平方+xy的立方=3/64

够详细了吧

（x+y）三次方×（2x+2y）三次方×（3x+3y）三次方=(x+y)³×8(x+y)³×27(x+y)³=216((x+y)的9次方

已知x,y满足方程组x方+2y=5,(1)x-y=-1(2)(1)+(2)*2x²+2x-3=0解得x1=1x2=-3代入(2)y1=2y2=-21.x1=1y1=2时x+y分之x的三次方-

多项式+（-2）^3+4(x^2)y+5y^3=x^3-3(x^2)y+2y^3,即：多项式=x^3-3(x^2)y+2y^3-[（-2）^3+4(x^2)y+5y^3]=x^3-(x^2)y-3y^

2x^4y^3-x^3y^4=x^3y^3*(2x-y)=(xy)³*(2x-y)=(-2)³*(1/2)=-8×(1/2)=-4

(2x^4)y³－x³y^4=(x³y³)(2x－y)=(xy)³(2x－y)=4³×(1/16)=4

先求出X或者Y的值,如求出X的值:简化计算式为=XY的三次方(2四次方X-Y)=2的三次方(16X-Y)=8(16X-Y)=8(12X-2)=96X-16带入X值即可!

1)(a²-b²)/(a+b)=(a+b)(a-b)/(a+b)=a-b2)-a³/a^4=-1/a3)(xy-x-y+1)/(y²-2y+1)=【（xy-x)

括号3z平方分之-3x三次方y括号的平方=(-3x³y/3z²)²=(-x³y/z²)²=z的4次方分之x的6次方y的平方

2x^4y^3-x^3y^4=x^3y^3(2x-y)=(xy)^3*1/3=8/3

显然x>0所以y>0所以原式=y√(2xy)/y-x√(3x)/x-2y√(2xy)/y+3x√(3x)=√(2xy)-√(3x)-2√(2xy)+3x√(3x)=-√(2xy)-√(3x)+3x√(

分式(x+y)的三次方分之11/(x+y)^3x的平方+2xy+y的平方分之11/(x^2+2xy+y^2)=1/(x+y)^2x-y分之11/(x-y)最简公分母是(x+y)^3*(x-y)=(x-

y-2x=-20102x-y=20102x^4y³-x³y^4=x³y³(2x-y)=(xy)³(2x-y)=10³×2010=201000

(4x^2-y^2)/(-2x-y)=(2x+y)(2x-y)/-(2x+y)=-(2x-y)=y-2x

6已知x+y=2,x-y=1,求分式x方+2xy+y方分之x方-y方的值x方+2xy+y方分之x方-y方=(x+y)(x-y)/(x+y)²=(x-y)/(x+y)=1/27已知x分之1-y

原式=5|x|√(xy)-2y*√(xy)/|x|-6x√(xy)/|x|=(5|x|-2y/|x|-6x/|x|)*√(xy)

(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