y(x-8)=xy-72 (y-5)*(x-8)=xy-72-60 能答重重有赏!
y(x-8)=xy-72 (y-5)*(x-8)=xy-72-60 能答重重有赏!
已知x-xy=8,xy-y=-9,求x+y-2xy的值
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
1\x+1\y=8\x+y,则y\xy+x\xy=?
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
(8xy-3x平方)-5xy-2(3xy-2x平方),其中,x=2,y=-1
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy的值
已知A=8x^2y-6xy^2-3xy,B=7xy^2-2xy+5x^2y,
已知xy除以x+y=2,求代数式8x-5xy+8y除以-x+3xy-y的值
1.已知x+4y=-1 xy=5 求(6xy+7y)+[8x-(5xy-y-6x)]的值
已知x+4y=-1,xy=5,求(6xy+7y)+{8x-5xy-y+6x)}的值