9m-2n=3 2x+y=5 x-y=3 解方程组 4n+m=-1 5x-y=9 3x-8y=14

X^3*y^(m-1)*x^(m+y)*y^(2n+2)=x^9y^9 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 2m+n 5 3 2m-n诺4x y 与x y 是同类项,m/n= 3x+4y=-5 5x+6y=-9 (n-8m)x-8y=10 5x+(10m+2n)y=-9 求m.m+n.n=? x+y=m,x-y=n,那么2x-3y等于 x+y=m,x-y=n,那么2x-3y等于多少 若-2x^2*y(-x^m*y+3xy^3)=2x^5y^2-6x^3y^n,求m,n的值? 4x^(m+6)y^2+X^3y^n=单项式,m^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 若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）. 2x^6n-x^4n×y^3m-y^9m,已知x^2n=3,y^3n=2,求值 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 已知M={(x,y)|y=-x^2+mx-1},N={(x,y)|y=-x+3,0 数学计算填空(5x+y)(5x-y)(5x+y)(-5x+y)(5x+y)(-5x-y)(5x+y)(x-5y)(x ^m+y ^n) （y ^n- x^ m)(x ^m+2y-3x^3)²(x-2y）(______)=4y²-x²(__________)²=m²-2m+1（只需要写一个代数式）(__________+3)²=4x²+(_______) （x+2y+2m)(2x-y+n)=2x^2+3xy-2y^2+5y-2 求m、n的值! 已知(x+2y+2m)(2x-y+n)=2x方＋3xy-2y方+5y-2,求m,n x-3y=2 3x=y 2x+y=2 -x+y=5m+4n=5 2m-n=12x+5y=5 3x-5y=10