X=5m/2+3n Y=5m/3+2n X:Y=3:2 求m:nX=5m/2+3nY=5m/3+2nX:Y=3:2求m:n

2m+n 5 3 2m-n诺4x y 与x y 是同类项,m/n= 已知单项式M,N满足3x(M-5x)=6x^2y^3+N,求M,N 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) 】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(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 方程2x的2m+n+3次方+3y的5n-m-4次方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= 2x^2m-n y^3m-2n 与5x^2n y^5是同类项,则m= ,n= 若2x^m-n+1y^3m-2n-5与-3x^n-1y是同类项,则m=___,n=____RT 已知单项式M N满足3x(M-5x)=6x^2y^2 求M N {2m+9n=48 {3m-5n=-15 求x和y 若3x^m+1y^2与x^3y^n的积是单项式3x^5y^5则n^m+m^n= (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 m/n=5/3,求（m/m+n）+（m/m+n)-（n^2/m^2-n^2) 已知m/n=5、,求（m/（m+n）)+(m/(m-n))-(n^2/(m^3-n^2)) 若x^3m=4,y^3n=5,求(x^2m)^3+(y^n)^3-^2m*y^n的值 函数y=(5m-3)x+n-2 若x^3m=4,y^3n=5,求(x^2m)^3+(y^n)^3-x^2n*y^n*x^4m*y^2n的值