（m+1)x^2+(n^2-3)x+y+0 当m,n为何值时,次方程为一元一次方程 当m,n为何值时,此方程为一元二次方程?

x^n*y*(-x^2y^m) (x+y)(m+n)2-(x+y)(m+n)2 m(x-y)^n+n(y-x)^2n因式分解 X^3*y^(m-1)*x^(m+y)*y^(2n+2)=x^9y^9 1)x^2-y^2-x+四分之一2)9m^2-n^2+3m-n 已知(m+n)x^n·y^m-2·(3xy^2+5x^2·y)=21x^m·y^n+1+35x^m+1·y^n,求m和n 已知M={(x,y)|y=-x^2+mx-1},N={(x,y)|y=-x+3,0 2y(x-y)^2-(y-x)^3过程具体!(1)2y(x-y)^2-(y-x)^3(2)(m-n)^3+m（n-m）^2-n（m-n）^2 已知x^m+n=3,y^m-n=2,求代数式(-1/3x^2m+n·y^5m-6n)·(1/2x^m+2n·y^2n-m) 若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）. 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= 设集合M={x|y=x+3},集合N={y|y=x^2+1,x属于M},则M∩N=__________ (1)(m+n)^3+2m(m+n)^2+m^2(m+n)= (2)[（x-2y)(x+2y)+4(1)(m+n)^3+2m(m+n)^2+m^2(m+n)=(2)[（x-2y)(x+2y)+4(x-y)^2］除以5x=(3)1.2345^2+(0.7655)^2+2.469乘0.7655-2.5^2= 计算：(x-y)^2/(x+y)÷(y-x)×1/(x-y)(m^2-4n^2)/(3mn^3)×mn/(m+2n) 已知集合M=｛y|y=x²-2x+3｝,N=｛y|y=2x²-3x+1｝则M∪N= 若[-3(x+y)^m*(x-y)^2n]^2*[-(x+y)^2]=-a(x+y)^10*(x-y)^12-n,求m,n的值 1.M={y/y=x²-2x-1},N={y/y=x²+2x+3},求M与N的交集2.M={(X,Y)/Y=X},N={(x,y)/y=2x-1},求M与N的交集3.M={x/y=根号（x-2）},N={x/y=根号（3-x）份之一},求M与N的交集 提公因式分解6(m-n)^2+3(m-n)、 2（x-y)-(x-y)^2