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Bài 1: Biết 2a+b/3 = a+2b/5 = 3(b+c)/7 . Tính giá trị của biểu thức A= 3a-5b/5a+11b Bài 2: Biết a/a = b/b = c/c =2019; a+b+c khác 0; 2a+5b-9c khác 0. Tính: a) a+b+c/a+b-c b) 2a+5b-9c/2a+5b-9c
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