Question

tìm Min của các biểu thức sau:
a, A= 7x²-2x+1

b, B= x²-xy+y²2x-2y

Giúp mk vs ạk!!! Mk cảm ơn trc!!!

Answer 1

a) \(A=7x^2-2x+1=7\left(x^2-\frac{2}{7}x+\frac{1}{7}\right)\)

\(=7\left(x^2+\frac{2}{7}x+\frac{1}{49}+\frac{6}{49}\right)\)

\(=7\left[\left(x+\frac{1}{7}\right)^2+\frac{6}{49}\right]=7\left(x+\frac{1}{7}\right)^2+\frac{6}{7}\ge\frac{6}{7}\)

Vậy \(A_{min}=\frac{6}{7}\Leftrightarrow x=\frac{-1}{7}\)