若x²-y²=1且x>0,y>0,求x√(1+y²)-y√(x²-1)的值
若x²-y²=1且x>0,y>0,求x√(1+y²)-y√(x²-1)的值
若|x+y-1|+(x-y-2)²=0,求代数式(x+2y)(x-2y)-(2x-y)(-y-2x)的值.
若x+y=3,xy=1,且x>y,⑴求x²+y²的值.⑵求x-y的值
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
若x,y都是实数,且√x 2 (y 1)²=0,求3x 2y的立方根
若实数x,y满足x的平方+2√3x+根号(x+y+1)+3=0,求代数式(1/x-y+1/x+y)÷y/(x²
x²-6y²=﹣xy 且x>0,y>0 求分式x+3y/x-y的值
求经过圆x²+y²-2x-2y+1=0,x²+y²-6x-4y+9=0的交点,且
1 题 规定运算*,使得x*y=x²+y²,若x,y是正整数,且x*y=625,求x+y=
求x²+y²-2x+4y+1的最小值 求x,y的值 x²+2xy+4x-12y+22=0
若x>0,y>0,且x-(√xy)-2y=0,求x/y的值