若3x-5√xy-2y=0(x>0,y>0),求√y分之x+x分之y的值

若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 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+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 已知x,y>0 2x+y+3=xy 求5x+4y最小值 若3x-5√xy-2y=0(x>0,y>0),求√y分之x+x分之y的值 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 已知:x>0,y>0,且x- 10√xy+25y=0,求2x+√xy+3y/x+√xy-y 下面都是求微分方程的通解：1、(y^-2xy)dx+x^2dy=0 2、(x^2+y^2)dy/dx=2xy 3、xy’-y=xtan(x/y)4、xy’-y=(x+y)ln[(x+y)/x] 5、xy’=√(x^2-y^2) +y新手求学,请大哥大姐们指点下~ 若根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x根号x+y-3+绝对值xy+x+y-2=0,求x/y+y/x 若两个正实数x,y满足x^2+2xy-3y^2=0,求x^2+xy+y^2/x^2-xy+y^2 若(3xy+2)^2+|7-x-y|=0,求代数式(5xy+10y)-[-5x-(4xy-2y+3x)]的值 若(3xy+2)+|7-x-y|=0,求代数式（5xy+10y）-[-5x-（4xy-2y+3x）]的值. 若2x^2-3xy+2y^2=0,x>0,y>0,x+y/x-y 已知（x+2）^2+|x+y+5|=0,求3x^2y-[2x^2y-(2xy-x^2y)-4x^2]-xy 若x²+xy-2y²=0,则x²+3xy+y²/x²+y²