\(B=7-2\sqrt{x-1}\), với \(x\ge1\)
Ta có \(2\sqrt{x-1}\ge0\)
\(\Rightarrow7-2\sqrt{x-1}\le7\)
=> B đạt giá trị lớn nhất bằng 7
\(\Leftrightarrow2\sqrt{x-1}=0\)
\(\Rightarrow\sqrt{x-1}=0\Rightarrow x-1=0\Rightarrow x=1\)
Vậy GTLN của B = 7 \(\Leftrightarrow\)x=1
tap hop cac gia tri nguyen x cua bieu thuc /2x + 2,5/+/2x -3/ dat gia tri lon nhat
tim gia tri nguyen cua x de bieu thuc:x^2+7/x+1 cung nhan gia tri la so nguyen
Tim gia tri nho nhat cua bieu thuc:
a, A= 2|3x - 2 | - 1
b, B= 5|1 - 4x | - 1
c, C = x2+ 3|y-2| - 1
d, D = x + |x|
e, E = | x - 7 | + 6 - x
Tim gia tri nho nhat cua A = | x- 2006 | + | 2007 - x | khi x thay doi !?!?
Tim gia tri nho nhat cua bieu thuc A = \(|2x-2|\) + \(|2x-2013|\) voi x la so nguyen !?!?
tim cac gia tri cua x de bieu thuc sau co gia tri bang 0:
P(x)=2x-7+(x-14)
Q(x)=x^2-64
tim cac gia tri cua x de bieu thuc sau co gia tri bang 0:
P(x)=2x-7+(x-14)
Q(x)=x^2-64
tim gia tri cua x de cac bieu thuc sau thuc sau:
A=3x+15
B=2x^2-32 co gia tri bang 0
Cho don thuc A= -xy2 , B=5xy3z, C=5xy2
a, Tim cac so nguyen x de bieu thuc M= \(\dfrac{3}{7-x}\) dat gia tri lon nhat