x+4y-3=0 2^x 16^y已知x+4y-3=0,求2的x次方乘以16的y次方的值.

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知X^2+Y^2+16X-4Y+68=0,则X+Y=----------- 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知4x-2y=0,求x-y/3x+2y的值 已知(x+y)^(2)+(x+3y-4)^(2)=0,求x,y的平方和 已知x,y>0 2x+y+3=xy 求5x+4y最小值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y 已知x^2-8x+y^2-y+16又1/4=0,求[(x+y)(x-y)-(x+y)^2-2y(x-3y)]÷4y的值 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简求值：已知x、y满足：x^2+y^2-4x+6y+13=0 求代数式 的值.(3x+y)^2-3(3x-y)(x+y)-(x-3y)(x+3y)急用！ 已知x=3分之一,y=-2分之一,求代数式x-(x+y)+(x+2Y)-(x+3y)+(x+4y)...-(x+2009y) 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 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y) 已知|x+y-3|+(x-y)2=0则