a+3c+a+2b=8+9
=>2a+2b+3c=17
=>2(a+b+c)+c=17
vì a+b+c lớn nhất
=>2(a+b+c) lớn nhất
=>c nhỏ nhất không âm
=>c=0
=>a=8
=>b=1/2
Vậy a = 8
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