XY+10=20.5,则X和Y不成比例.______.
x-2y=0(x、y均不等于0),则x与y不成比例.______(判断对错).
实数x,y满足x≥y≥1和2x2-xy-5x+y+4=0,则x+y=______.
ab-8=17.25,则a和b不成比例______.
已知x+y=4,xy=2,则x2+y2+3xy=______.
已知两个正数x,y满足x+4y+5=xy,则xy取最小值时x,y的值分别为______,______.
已知x-y=5,xy=3,则3xy-7x+7y=______.
已知x,y都是正实数,且x+y-3xy+5=0,则xy的最小值______.
因式分解:(x+y)(x+y+2xy)+(xy+1)(xy-1)=______.
设x,y∈R+且xy-(x+y)=1,则x+y的最小值为______.
已知正实数x,y满足xy+2x+y=4,则x+y的最小值为______.
已知正实数x、y满足x+2y=xy,则2x+y的最小值等于______.
已知x>0,y>0,x+y+xy=8,则x+y的最小值是______.