Question

Cho abc =15

Tinh M = 2015.a  / ab + 2015.a + 2015     +     b / bc + b + 2015           +         c / ac + c +1

Answer 1

abc = 2015 :))

Answer 2

https://olm.vn/hoi-dap/question/764972.html

Answer 3

tự hỏi vs tự trả lời

Answer 4

điều kiện là abc = 2015 nha ko p abc = 15

Answer 5

Gõ link mk gửi là có, link mà đang chờ duyệt ấy

Answer 6

Ta có: \(M=\frac{2015a}{ab+2015a+2015}+\frac{b}{bc+b+2015}\) \(+\frac{c}{ac+c+1}\)

\(=\frac{2015ac}{abc+2015ac+2015c}+\frac{b}{bc+b+abc}\) \(+\frac{c}{ac+c+1}\)

\(=\frac{2015ac}{2015\left(1+ac+c\right)}+\frac{b}{b\left(c+1+ac\right)}\)\(+\frac{c}{ac+c+1}\)

\(=\frac{ac}{ac+c+1}+\frac{1}{ac+c+1}+\frac{c}{ac+c+1}\) \(=\frac{ac+c+1}{ac+c+1}=1\)

\(\Rightarrow M=1\)