求2道计算题①（x+y)^7×（x+y)×（x+y)^2②﹙m－n﹚^2×﹙n－m﹚^4×﹙n－m﹚^3

(x+y)(m+n)2-(x+y)(m+n)2 把下列各式因式分解(2m+3n)(2m-n)-4n(2m-n)(x+y)^2(x-y)+(x+y)(y-x)^24a(x 已知 ,单项式M,N满足等式2x﹙M-x﹚=6x²y³＋Nx²,求M,N 分式计算题2道 3x/(x-3)² - x/3-x m+2n/n-m + m/n-m - 2m/n-m 三道计算题(-2y^2-3x)(3x-2y^2) -（3m^2-n)(3m^2+n) (1/2a^m-b^n)(b^n+ 四道计算题(-2y^2-3x)(3x-2y^2) -（3m^2-n)(3m^2+n) (1/2a^m-b^n)(b^n+ 已知,单项式M,N满足2x(M+3x)=6x^2y^2+N,求M,N. 已知单项式M、N满足2x(M+3x)=6x^2y^2+N,求M、N. 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知,单项式M,N满足2x（M+3x)=6x²y²+N,求M,N 7x的m+2次方y的|m|＋1和12x的n的平方+2次方y的2次方是同类项 m n互为相反数 求 m－mn－3m+3\4 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,