√(y+1)≤4÷(y-1)

√(y+1)≤4÷(y-1) 4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3) (x+y)(x-y)+4(y-1) (y+3)(4y-1) [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y -y - y/1-y +1 3(y+1)>4y+2 2（y-1）≤3y 解不等式 解下列不等式组 y-4≤3(y-2) 1+2y>3(y-1) (-3y^n+1+4y^n+2-12y^n)÷(-24y^n-1) 4y(y-1)=3 3y^2+2√6y=-2 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 方程y''-4y'+13y=0的通解方程y''=(1+y'*y')/2y的通解 已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=,求4x/（4²-y²）-1/（2x+y)的值已知：【（x²+y²）-（x-y)²+2y（x-y)】÷4y=1，求4x/（4²-y²）-1/（2x+y)的值 [(-2x-y)^2-(2x+y)(2x-y)]÷2y-1/2y 解分式方程（y+3)/(y^2+y)-1/(1-y)=4/y要过程 2(y-4)(3y+2)-5(-3y+7)(y+1),其中y=-1