已知x+y=0,求x^3+x^2*y+xy^2+y^3
3个回答
x^3+x^2*y+xy^2+y^3
=(x^3+x^2*y)+(xy^2+y^3)
=x^2(X+y)+Y^2(X+Y)
因为X+y=0
所以原试的值为0
相关问题
已知 x-2y=0 求x^-3xy+y^/2x^+xy-3y^的值
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
1.已知X>0,Y>0,且√X(√x+√y)=3√y(√x+5√y),求(2x+(√xy)+3y)/(x+(√xy)-y
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/xy的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y²
已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y
已知:3x2-xy-4y2=0(x≠y)求(x—2y)/(x+2y)
已知x/2=y/3(xy≠0),求x²-2xy-3y²/x²-6xy-7y²的值
1、已知3x²+xy-2y²=0(x≠0,y≠0)求x/y-y/x-(x²+y²
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)