Từ \(\frac{a}{b}\) = \(\frac{132}{143}\) = \(\frac{12}{13}\) => \(\frac{a}{12}\) = \(\frac{b}{13}\)
Đặt \(\frac{a}{12}\) = \(\frac{b}{13}\) = k => a= 12k ; b=13k
BCNN(a,b)=BCNN(12k;13k) = 12.13.k = 1092
=> k =7 =>a= 7.12 = 84
Vậy a = 84
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