若x=√3-√2,y=√3+√2,则xy的值为() A.2√3 B.2√2 C.5 D.1

已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y 若|2x+y+1|+√2y+3x=0,则xy= √x(√x+2√y)=√y(6√x+5√y,求x-3√xy+2y/x+√xy-6y 若x>o,y>o,且根号x(根号x+根号y)=3根号y(根号x+5根号y)求x+根号xy分之2x-根号xy-5y式子是√x（√x+√y）=3√y（√x+5√y），求x+√xy分之2x-√xy-5y 若x>0,y>0,且x-2√xy-3y=0,求(√×y-3y)/(x-√xy)的值 若xy满足x²+2x+y-2√y-1=-1,求xy, 设x、y为实数,若4x^2+y^2+xy=1,则2x+y的最大值是我这么做为什么不对4x^2+y^2 + xy = 1=>4x^2+y^2 = 1 - xy,(2x+y)^2 = 1 + 3xy4x^2+y^2 ≥ 2*2x*y =4xy,1-xy ≥4xy=>xy ≤1/5(2x+y)^2 = 1 + 3xy ≤ 1+3/5 = 8/52x+y≤√(8/5)2x+y的最大 先化简,再求值:(x^2-2xy+y^2)/(x^2-xy)÷(x/y-y/x),其中x=3-√3,y=√3 若x、y为整数,√x（√x+√y）=3√y（√x+5√y),试求2x+(√xy)+3y除以x+(√xy)+y 若实数x,y满足x√(1-x)=√(y-2)+√(1-x),则(3x^2+xy-y^2)/(x^2-xy+y^2)=? 设√x(√x-√y)=√xy+3y,求2x+3√xy-y/3x-y的值. 若x＞0,y＞0,且√x(√x+√y)=3√y（√x+5√y）,求（2x+2√xy+3y）/（x-√xy+y）的值.若x＞0,y＞0,且√x(√x+√y)=3√y（√x+5√y）,求（2x+2√xy+3y）/（x-√xy+y）的值. 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 |x^2-3xy-4y^2|+2√(x^2+4xy+4y^2-1)=0 求3x+6y的值 若 |x^2-3xy-4y^2|+2√(x^2+4xy+4y^2-1)=0 求3x+6y的值