(xy＾3n)＾2+(xy＾6)＾n=?

(xy＾3n)＾2+(xy＾6)＾n=? (xy^3n)^2 +(xy^6)^n (xy^3n)^n +(xy^6)^n =? (xy^2)^(3n)+(xy^n)^6 等于几 已知x＾n=5,y＾n=4,求(xy)＾2n的值 若x^2n=2,（y^n)^3=3,则（xy)^6n= 若x^2n=2,(y^n)^3=3,则(xy)^6n等于? x^2n=3,y^3n=4 (xy)^6n=? (xy的3n次方)的2次方+(xy的6次方)的n次方 (xy的3n次方)的2次方+(xy的6次方)的n次方 】已知:【M】=-5x^2+3xy-2y^2,【N】=5x^2-6xy+2y^2.求：M-N、M+N、N-(M-N)】已知:【M】=-5x^2+3xy-2y^2,【N】=5x^2-6xy+2y^2求：M-N、M+N、N-(M-N) 已知（x+y+z）＾2≥n(xy+yz+zx),n能取最大值为? y∧2n=3,试求x∧6n×y∧4n和（xy）∧（6n+4n）,原式=(xy)^10n又怎么算， (xy^3n)^2等于多少 (x^2y^6)^n+3(-xy^3)^2n+2(-x^ny^3n)^2 以知单项式M.N满足3X(M+6X^2)=18XY+N,求M和N 已知单项式M、N满足3x(M+6x^2)=18xy+N,求M和N? 已知x^n=5,y^n=3,求（xy）^2n的值