若实数xy满足4^x+4^y=2^(x+1)+2^(y+1)则s=2^x+2^y的取值范围
若实数xy满足4^x+4^y=2^(x+1)+2^(y+1)则s=2^x+2^y的取值范围
若实数x,y满足2x*X+3y*y=1,S=3x*x-2y*y,则S的取值范围为
已知实数XY 满足方程X^2+Y^2+4X+3=0 则S=(X-1)^2+(Y+3)^2的取值范围
若实数xy满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是
实数X.Y满足X*X+Y*Y-2X-2Y+1=0,则(Y-4)/(X-2)的取值范围是?
已知实数xy满足x^2+y^2=1,则(y+2)/(x+1)的取值范围是多少
若实数x,y满足:xy=2-x,则x+2y的取值范围
已知实数x,y满足x^2+y^2=4,求下列各式的取值范围:(1)3x+4y.(2)xy
已知实数x,y满足xy+1=4x+y,若x,y为正实数,则xy的取值范围是?
若实数x、y满足2x^2+3y^2=1,s=3x^2-2y^2,则S的取值范围是
已知实数xy满足X的平方+y的平方=1,求y/x+2的取值范围
若实数x,y满足2x²+3y²=1,S=3x²-2y²,则S的取值范围是