cau oi to thay lam theo cach dau la on roi ma
tai sao lai phan tich ra chi nhieu cho dai dong
y cua to lam theo cach khac la the nay
câc cau xem thu nhe
dat p(x,y)=m\Leftrightarrowf(x)=p(x,y)-m=x^2-2(3y-4)x+(11y^2-28y+21-m)=0
f(x) co nghiem\Leftrightarrow denta=-2y^2+4y+m-5\geq0m\Leftrightarrow2(y-1)^2+3
minp=3