(2y+2)^2+y^2-2(-2y-2)-4y-4=0

y²+y-2 y (3y^2+8y-3)-6y(3y+2y-1)+9y x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 yy''-(y')^2=y^2y' yy''-(y')^2=y^2y' y+y'-2y=2x 因式分解 -y的立方-2y-y 微分方程y - 2y' + y = x 2y''+y'-y=0 因式分解 (y^2+y)^2-8(y^2+y)+12 (y平方+2y)(y平方+2y+2)+1 [(x-y)^2-(x+2y)(x-2y)]/y y'(2y-y')=y^2*(sinx)^2求解, y^2+y-2/y^2+4y+4约分 (y^2)^4y-(-2y)^3y^6= (3y+2)(y-4)-3(y-2)(y-3) 化简y(x+y)+(x+y)(x-y)-x^2 方程y''=(1+y'*y')/2y的通解