已知x和y满足2x+3y=5,则当x=4时,代数式3x2+12xy+y2的值是( )
已知x和y满足2x+3y=5,则当x=4时,代数式3x2+12xy+y2的值是( )
已知x和y满足2x+3y=5,则当x=4时,代数式3(xXx)+12xy+(yXy)的值是( )
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知:x=3,y=-5,x2-2xy+y2/x2-y2的值是
已知x-y=-3,-x+3y=2,求代数式x2-4xy+3y2的值
已知x≠y ,x2-x=3 ,y2-y=3 ,求代数式x2+xy+y2 的值.
已知x(x-1)+(y-x2)=6,则代数式x2+y2/2-xy的值是
已知X2+Y2+8X+6Y+25=0 求代数式X2++XY+4Y2分之X2-4Y2 减X+2Y分之X的值
已知实数xy满足x2+y2-4x+3=0则(x+y-3)/(x-y+1)的取值范围是
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知实数x,y满足方程组x+xy+y=2+3根号2和x2+y2=6.求|x+y+1|的值.
已知实数x、y满足2x2-7xy+3y2=0,求x:y