x∧(-1/2)y∧(1/2)÷x∧(1/2)y∧(-1/2)等于多少

y=(x-1)÷2x-1y=x∧2(x ≤0)y=-x∧2(x≤0)y=-x∧2+2x+1(x≥1） [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 设随机变量(X,Y)的概率密度为f(x,y)=1/2(x+y)e∧-(x+y),x>0,y>0.0其他.问X和Y是否相互独立,求Z=X+Y的概 1／2x－（x+y／2x -x-y）÷（x+y) y=2x∧2+2x+3/x∧2+x+1求值域, 已知有理数x,y满足关系式y=[√(x^2-1)+√(1-x^2)/(x-1)]-x+2,求x∧y的值. 1/xy-y∧2,x+y/x∧2-y∧2通分, y=(x∧2-x+3)/(x-1),x属于（-∞,0）得值域 先化简,再求值(x+2y)∧2-(x+y)(3x-y)-5y∧2,其中x+-2,y=1/2过程写不写无所谓!急 先化简,再求值(x+2y)∧2-(x+y)(3x-y)-5y∧2,其中x+-2,y=1/2急 求通解(1+x)y'-y=(1+x)∧2·y∧(-1) 化简：[(2x-y)平方+（2x+y)(2x-y)-4x(x-y+1)]÷2x y=x∧2-2|x|-1的图像 先化简,再求值:y(x-y)-x(x+y)/x²-y²÷x²+y²/x+y,其中x=2,y=-1 y＝x∧2/x+1的值域 1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²] 1-[(x-y)/(x+2y)]÷[(x+y)(x-y)/(x+2y)²]= (x-y/1-x+y/1)÷2y/y-x计算错了，是(1/x-y-1/x+y)÷2y/y-x