高三题目:已知实数x、y满足1≤x²+y²≤4,求f(x,y)=x²+xy+y²
高三题目:已知实数x、y满足1≤x²+y²≤4,求f(x,y)=x²+xy+y²
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知实数xy,满足10x²-2xy+y²+6x+1=0,求x+y
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足5x²+2y²+1=6xy+4x-2y,则x²-xy+2000y
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x²-3xy+3y²+4x-18y+52=0求y的x次方的个位
已知实数X,Y满足X²-3XY+3Y²+4X-18Y+52=0.求Y的X次方的个位数
已知实数x、y满足x²﹢y²-xy+2x-y+1=0,试求x、y的值
实数x y满足x≥y≥1和2x²-xy-5x+y+4=0求x+y之值
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.
已知x,y均为实数,且满足XY+x+y=17,xy²+x²y=66,求x²+y²