Question

\(\frac{2a+b+c+d}{a}=\frac{a+2b+c+d}{b}=\frac{a+b+2c+d}{c}=\frac{a+b+c+2d}{d}\)

\(tinh..M=\frac{a+b}{c+d}+\frac{b+c}{d+a}+\frac{c+d}{a+b}+\frac{d+a}{b+c}\)

Answer 1

ai tra loi di chu

Answer 2

co biết làm đâu mà trả lời 

Answer 3

ta se tru moi ve di 1

2a+b+c+d/a -1 = a+b+c+d/b -1 =a+b+2c+d/c-1 = a+b+c+2d/d -1

a+b+c+d/a = a+b+c+d/b = a+b+c+d/c = a+b+c+d/d 

roi xet tung kha nang cua a+b+c+d=0

va a+b+c+d khac 0

ok nha 

byebye

love you

Answer 4

thu goi y xem co khi lai lam duoc