Tìm các số nguyên x biết: \(\frac{-24}{x}\)= \(\frac{12}{7}\) \(\frac{x}{15}\)= \(\frac{9}{45}\) ...
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Tìm các số nguyên x biết: \(\frac{-24}{x}\)= \(\frac{12}{7}\)
\(\frac{x}{15}\)= \(\frac{9}{45}\)
\(\frac{x-3}{7}\)= \(\frac{24}{21}\)
\(\frac{-24}{x}=\frac{12}{7}\)
\(\Rightarrow\frac{-24}{x}=\frac{12\cdot2}{7\cdot2}\)
\(\Rightarrow\frac{-24}{x}=\frac{24}{14}\)
\(\Rightarrow\frac{-24}{x}=\frac{-24}{-14}\)
\(\Rightarrow x=-14\)
\(\frac{x}{15}=\frac{9}{45}\)
\(\Rightarrow\frac{3x}{3\cdot15}=\frac{9}{45}\)
\(\Rightarrow\frac{3x}{45}=\frac{9}{45}\)
\(\Rightarrow3x=9\)
\(\Rightarrow x=9:3\)
\(\Rightarrow x=3\)