2(2x+3y)(3x+2y)-(6x-y)(2x-5y) =12x^2+26xy+12y^2-
2(2x+3y)(3x+2y)-(6x-y)(2x-5y) =12x^2+26xy+12y^2-
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
(x+y)(x-y)-(2xy+3y)平方
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
√x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y
∫x(∫x+2∫y)=∫y(6∫x+5∫y),求:(x+∫xy-y)/(2x+∫xy+3y)