Cách làm cho bạn:
a) \(BCNN(8,27) = 216\)
\(\frac{3}{8}=\frac{3.27}{8.27}=\frac{81}{216}\)
\(\frac{5}{27}=\frac{5.8}{27.8}=\frac{40}{216}\)
b) \(BCNN(9,25) = 225\)
\(\frac{-2}{9}=\frac{-2.25}{9.25}=\frac{-50}{225}\)
\(\frac{4}{25}=\frac{4.9}{25.9}=\frac{36}{225}\)
c) \(BCNN(15,1) = 15\)
\(\frac{1}{15}=\frac{1}{15}\)
\(-6=\frac{-6.15}{15}\frac{-90}{15}\)
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