Question

Tìm giá trị nhỏ nhất của A 

\(A=2x^2+9y^2-6xy-6x-12y+2016\)

Answer 1

56% của 5789 kg là :

5789 x 56% = 3241,84 kg

Đáp số : 3241,84 kg

Answer 2

\(A=9y^2-6xy-12y+2x^2-6x+2016\)

\(A=\left(3y\right)^2-2.3y\left(x+2\right)+\left(x+2\right)^2-\left(x^2+4x+4\right)+2x^2-6x+2016\)

\(A=\left(3y-\left(x+2\right)\right)^2+x^2-10x+2012\)

\(A=\left(3y-x-2\right)^2+\left(x-5\right)^2+1987\)

Vậy GTNN của A = 1987 khi x=5 và y=7/3.

Answer 3

câu trả lời ngắn gọn thôi

................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ HỌC SINH TỰ LÀM