因式分解x²+x-72 -x²-6x+10 若x、y满足2x+y-4=0求xy的最大值
因式分解x²+x-72 -x²-6x+10 若x、y满足2x+y-4=0求xy的最大值
若有理数X、Y满足x²-4x+y²+6y+13=0,求xy的值
实数XY满足X*X+Y*Y+2X-4Y+1=0,求Y/(X-4)的最大值和最小值及根号下X*X+Y*Y+2X+1的最大值
若实数xy满足x^2+y^2-2x+6y=0 则x-2y的最大值
若正数x,y满足x²-y²=2xy,求(x-y)/(x+y)的值
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知实数x,y满足x²+2xy-1=0,求x+y的取值范围.当0≤x≤4时,求y=根号x-x的最大值和最小值.
实数xy满足2x²+2x+y-1=0则x+y的最大值
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
若实数XY满足方程X²-XY-2Y²+5x-4y+6=0试求x²+y²的最小值
若是数xy满足x²+4x+y²-6y+13=0,求x,y的值
已知x,y为实数,且满足2x²-6x+y²=0,求x²+y²+2x的最大值