Có x2 >= 0 với mọi x
=> x2 + 2 >= 2 với mọi x
=> ( x2 + 2)2 >=4 với mọi x
=>5 - (x2 + 2)2 >=1 với mọi x
dấu bằng xảy ra <=> x2 = 0 <=> x = 0
VẬY NHA BẠN
TIM GIA TRI LON NHAT CUA BIEU THUC :
C=2+12/3x/X+5/+4
TIM GIA TRI NHO NHAT CUA BIEU THUC
C= -15/ 4x / 3X+7/+3
gia tri lon nhat cua bieu thuc B = 5/2-|3x-7/6|
cho bieu thuc A = 2012 / 9 - x . Voi gia tri nguyen cua x thi A co gia tri lon nhat ? Tim tri lon nhat do .
tim gia tri lon nhat cua bieu thuc : -x2 + 2
gia tri lon nhat cua bieu thuc A=-|x+2|-11thoa man la
Tim gia tri lon nhat cua bieu thuc P = -2|x-1|-7
cho bieu thuc A = 2006 -x / 6-x tim gia tri nguyen cua x de A dat gia tri lon nhat. Tim gia tri lon nhat do
tim gia tri lon nhat cua bieu thuc :
b) D= 2 I 7x+5I +11/ I 7x+5I +4
tim GTNN cua bieu thuc :
c) C= 5+ -8/ 4x I5x+7I 24
tim gia tri lon nhat cua bieu thuc :
b) D= 2 I 7x+5I +11/ I 7x+5I +4
tim GTNN cua bieu thuc :
c) C= 5+ -8/ 4x I5x+7I 24