已知x,y∈R,x²+y²=2x+8,求x²+y²最值
已知集合M={y|y=2^x,x∈R},集合N={y|y=x²,x∈R},求M∩N
已知x∈r,f(x)+2f(1-x)=x²+x,求y=f(x)
已知x、y是实数,且x²+y²-4x-6y+12=0.求x²+y²的最值,x-y
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x,y的值满足方程组x+2y=3,x-y=-2,求x/(x-y)²+x²-y²/(x+
已知集合A={(x,y)|x²+y²≤1.x.y∈R},B={(x,y)||x|+|y|≤2.x.y
已知M={y|y=x²-4x+3,x∈R},N={y|y=-x²+2x+8,x∈R},求M∩N 答案
已知x² +y²+5/4=2x+y,求y-x的值
已知x²+4y²-6x+8y+13=0,求x-y/x+y的值.
已知y-2x=0,求3x²-2y²/(x+y)(x-y)的值
已知x+3y=2,求代数式(x²-y²/x+y)-【2(x+y)】的值
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y