填空--- 已知4x-5y=1,x+y大于等于0,求x的最小值.

填空--- 已知4x-5y=1,x+y大于等于0,求x的最小值. 已知：4x = 5y,求(x+y) ：y x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知x×x×y×y+x×x+y×y+1=4xy,求x,y的值快 已知:3x-5y=0,求x/y,x-y/y,x-y/x 填空题 x+y/4=x-y/6=3x+12y+5/8 x= y= 已知5x-4y=0,求x:y和x+y:y的值 已知:【(x²+y²)-(x-y)²+2y(x-y)】/4y=1,求4x/4x²-y²-1/2x+y 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 (3x-2y)(4x-5y)-11(x+y)(x-y)+5xy,已知X=3又1/2,y=2又1/3 已知5x=4y,则x:y=():() 求道一元二次方程的填空题`````````````````````已知x^2+y^2-2x+4y+5=0,则2x+4y=?求个解和过程`` 大括号x+y/2+x-y/3=6,4(x+y)-5(x-y)=2 快 大括号x+y/2+x-y/3=11/6 4(x+y)-5(x-y)=7 快 高一数学填空题3(4)已知x>0,y>0,且1/x+9/y=1,则x+y的最小值________ 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-(x+2009y)的值.