求y=2x+5/x-29（x

求y=2x+5/x-29（x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 已知:3x-5y=0,求x/y,x-y/y,x-y/x 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+. 求y=(5x-1)/(4x+2) (x x*x+y*y-2x+4y+5=0求x, 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 1.log2(x)=log4(x),求x2.2^x=5^y,求x/y 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. 求y=(x^2)+2x(x≥0) y=-x+2x(x 求dy/dx=(x-y+5)/(x+y-2) y=4x^2-5x+7/x-2(x>2),求y最值 y=x^3-5x^2+2x-8 求y^2求y撇 已知y=根号2-x+根号x-2+5x,求y/x的值 6x+5Y=31 2X+3Y=17求X求 Y