cho 2x+y=6 tim gia tri lon nhat K=xy
tim gia tri lon nhat cua M= -3x^2-6x+9
Tim gia tri lon nhat cua P= -5x^2 - 4x + 1
tim gia tri lon nhat khi B=5/3x^2+4x+15
tim gia tri lon nhat khi A=3/(2x^2+2x+3)
tim gia tri lon nhat
A=4-x^2+2x
Tim gia tri lon nhat cua bieu thuc p=-x^2+13x+2012
tim gia' tri. lon' nhat' cua? bieu thuc
F=-x^2-4x+20
tim gia tri lon nhat
-x^2-y^2+2xy+xy+2x
