BP
DL
17 tháng 6 2022 lúc 20:38

\(M=\dfrac{10}{5}.\dfrac{5}{7}.\left(\dfrac{15}{5}\right).\dfrac{5}{7}\)

\(M=2.\dfrac{5}{7}.3.\dfrac{5}{7}\) = \(6.\dfrac{5}{7}.\dfrac{5}{7}=6.\left(\dfrac{5}{7}\right)^2=\dfrac{150}{49}\)

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