若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是

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若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是
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若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是
若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是

若m=x^3-3x^2y+2xy^2+3y^3,n=x^3-2x^2y+xy^2-5y^3,则2x^3-7x^y+5xy^2+14y^3的值是
m-n=8y^3+xy^2-x^2y
2x^3-7x^2y+5xy^2+14y^3
=(x^3-3x^2y+2xy^2+3y^3)+(x^3-2x^2y+xy^2-5y^3)-2x^2y+2xy^2+16y^3
=m+n+2(8y^3+xy^2-x^2y)
=m+n+2(m-n)
=3m-n

若(3x^2y-2xy^2)/M=-3x+2,则单项式M等于（ ） A.xy B.-xy C.x D.-y 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 已知M-(2x^2-3xy+xy^2)(-xy)=(2x^2 y+xy^2)（x-2y）,求多项式M 若-2x^2*y(-x^m*y+3xy^3)=2x^5y^2-6x^3y^n,求m,n的值? 已知M-(2x的平方-3xy+xy的平方)(-xy)=(2x的平方y+xy的平方）（x-2y) 若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值 若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少? 若xy/x+y=2,则3x-xy+3y/-x+3xy-y= 若xy=2（x+y),求 （3x-5xy+3y)÷(-x+3xy-y) 的值 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 （-3x^y+2xy)-( )=4x^+xy 若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)= x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? 若(3x²y-2xy²)÷M=-3x+2y,则单项式M等于