Question

help với mn

Answer 1

\(a,-\dfrac{3}{35};-\dfrac{2}{63}\)

Có \(MSC=35\times63=2205\)

\(\left\{{}\begin{matrix}-\dfrac{3}{35}=\dfrac{-3\times63}{35\times63}=-\dfrac{189}{2205}\\-\dfrac{2}{63}=\dfrac{-2\times35}{63\times35}=-\dfrac{70}{2205}\end{matrix}\right.\)

\(b,-\dfrac{1}{24};\dfrac{5}{12};-\dfrac{3}{16}\)

Có \(MSC=48\)

\(\left\{{}\begin{matrix}-\dfrac{1}{24}=\dfrac{-1\times2}{24\times2}=-\dfrac{2}{48}\\\dfrac{5}{12}=\dfrac{5\times4}{12\times4}=\dfrac{20}{48}\\-\dfrac{3}{16}=\dfrac{-3\times3}{16\times3}=-\dfrac{9}{48}\end{matrix}\right.\)