(x-y) 除以√x-√y 怎么化简
ln(x-y)除以ln(x+y)怎么计算
【(x-y)^2+(x+y)(x-y)】除以 2x
化简求值:【(x+2y)的2次方-(x+y)(x-y)-7y的2次方】除以2y,其中x=-1,y=-2
x+y分之x-y除以(y-x)怎么做
请问√(x-y)^+√(x+y)^怎么做.
若x.y是实数,且y小于根号(x-1)+根号(1-x)再加1/2,化简绝对值(1-y)除以(y-1) 若x.y
(√xy -xy分之x+√xy)除以√xy -y分之x-y(x>0,y.0)
已知√(x-2y)+|x^2-25|除以(x+5)=0,求x/y的值
怎么化简(x-y+4xy/x-y)(x+y-4xy/x+y)(/是分数线)
化简求值: 1:根号下5减2倍根号6 2:√xy除以y√x-x√y
{(z+y)(x-y)-(x-y)的2次方+2y(x-y)}除以4y
化简求值1.x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2X=1Y=-2011