x+y=32x+3y=8求XY

诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 x加y=8,xy=7,求3xy减x减y+4 x/3=y/4,求(x*x-xy)/(x*x+y*y)的值 x+y=32x+3y=8求XY 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 x+y=8,xy=15,求x^3y+2x^2y^2+xy^3 已知x,y为正整数,并且xy+x+y=71,x^2y+xy^2=880,求3x²+8xy+3y² x*x-xy=-3,2xy-y*y=-8,求2x*x-4xy+y*y的值 已知1/x+1/y=8,求2x-3xy+2y/x+2xy+y的值 y'+xy=x^3求微分 |x|/x+y/|y|+xy/|xy|= 已知x-xy=8,xy-y=-9,求x+y-2xy的值 当x-y=2xy时,求4x-3xy-4y/xy 已知(x+y):y=8:3,求2x+5y/3x-y和x^2-xy/y^2+3xy的值 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值.已知xy/x+y=3,求代数式3x-5xy+3y/-x+3xy-y的值. 已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.已知X+Y=3XY,求2X+2Y-XY除以X+Y+2XY的值,要算理.