Question

若关于x,y的多项式x^(m-2)y^2+mx^(m-2)y+nx^3y^(m-3)-2x^(m-3)y+m+n,化简后

Answer 1

m=5,n=-1

x^(m-2)y^2+mx^(m-2)y+nx^3y^(m-3)-2x^(m-3)y+m+n

=x^3y^2+5x^3y-x^3y^2-2x^2y+5-1

=5x^3y-2x^2y+4