Ta có:
\(\left(x+\dfrac{1}{2}\right)^2\)+1\(\ge\)1
mà \(\left(x+\dfrac{1}{2}\right)^2\)\(\ge\)0
Dấu ''='' xảy ra khi:
\(\left(x+\dfrac{1}{2}\right)^2\)=0
=>x+\(\dfrac{1}{2}\)=0
=>x=\(\dfrac{-1}{2}\)
Vậy GTNN của \(\left(x+\dfrac{1}{2}\right)^2\)+1 là 1 khi x=\(\dfrac{-1}{2}\)
Tim gia tri nguyên cua x de biểu thuc M=\(\dfrac{2014-x}{x-2013}\) có gia tri nho nhat?
Tim gia tri nho nhat cua bieu thuc :
a)A=\(\left|x+5\right|+2-x\)
b)B=\(\left|x-1\right|+x+6\)
tim gia tri nho nhat cua bieu thuc : \(\left|x-2013\right|+\left|x-2014\right|+\left|x-2015\right|\)
Tim gia tri nho nhat cua bieu thuc : A=\(\dfrac{21\left|4x+6\right|+33}{3\left|4x+6\right|+5}\)
tim gia tri lon nhat :
D=\(\dfrac{2\left|x\right|+3}{3\left|x\right|-1}\)
tim gia tri nho nhat cua cac biet thuc sau: D=-10//x/+10
tinh gia tri bieu thuc cua dai so x2y3 +xy tai x=1 va y=1/2
Cho a thuc B(x) = m^2 x^ 2016 +2 mx^2015 +1 Tim gia tri M de B (x) có nghiêm là -1
Tim n nguyen de bieu thuc co gia tri nguyen :
A= \(\dfrac{3n+1}{n+1}\) ( voi n khac -1)
