Question

tìm x

28/-63=-4/x

Answer 1

\(\dfrac{28}{-63}=\dfrac{-4}{x}\\ \Leftrightarrow\dfrac{-28}{63}=\dfrac{-4}{x}\\\Leftrightarrow\dfrac{-4}{9} =\dfrac{-4}{9}\\ \Leftrightarrow x=9\)

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Answer 2

\(\text{\dfrac{28}{-63} = \dfrac{− 4}{x} ⇔ \dfrac{− 28}{63} = \dfrac{− 4 }{x}⇔\dfrac{ − 4 }{9} = \dfrac{− 4}{x} ⇔ x = 9 }\)