y=x+1①2x-y=3②5m+3n=18①2m-3n=3②2/x-3/y=1①2x+3y=4②

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 X^3*y^(m-1)*x^(m+y)*y^(2n+2)=x^9y^9 已知M={(x,y)|y=-x^2+mx-1},N={(x,y)|y=-x+3,0 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= 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+(_______) 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) y=x+1①2x-y=3②5m+3n=18①2m-3n=3②2/x-3/y=1①2x+3y=4② (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= 已知集合M=｛y|y=x²-2x+3｝,N=｛y|y=2x²-3x+1｝则M∪N= 解下列方程组：①、3x-y=5,4x+y=2 ②、3m=2n-5,2m+n=-1 解下列方程组：①、3x-y=5,4x+y=2 ②、3m=2n-5,2m+n=-1 若x^3y^m-1*x^m+n*y^2n+2=x^9y^9,则4m-3n=（）. (m+n)x^n y^(m-2)(3xy^2+5x^2y)=21x^m y^(n+1)+35x^(m+1)y^n M和N 要 （m+n)x^ny^(m-2)（3xy^2+5x^2y)=21x^my^(n+1)+35x^(m+1)y^n=7x^(m-1)y^(n-1)(3xy^2+5x^2y)m+n=7n=m-1m-2=n-1n=3,m=4 设集合M={x|y=x+3},集合N={y|y=x^2+1,x属于M},则M∩N=__________ 若2x^m-n+1y^3m-2n-5与-3x^n-1y是同类项,则m=___,n=____RT 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 .m（x-y)²-x+y 5(y-x)²+3（x-y) 15*（a-b)²-3y(b-a) 6(m-n)³-12（n-m)²13/x-4-10/x-3=1/x-1 已知函数y=(n-1)x^(n方+2n+2)+m+3① 当n为多少时,y是x的一次函数?②当y是x的正比例函数求M+N的值