Ta có:
+) \(\displaystyle{{ - 4} \over 8} = {x \over { - 10}}\) nên \(\displaystyle\left( { - 4} \right).\left( { - 10} \right) = 8.x \)
\(\displaystyle\Rightarrow x = {{ - 4.( - 10)} \over 8} = {{40} \over 8} = 5\)
+) \(\displaystyle{{ - 4} \over 8} = {{ - 7} \over y}\) nên \(\displaystyle\left( { - 4} \right).y = 8.\left( { - 7} \right) \)
\(\displaystyle\Rightarrow y = {{8.( - 7)} \over { - 4}} = {{ - 56} \over { - 4}} = 14\)
+) \(\displaystyle{{ - 4} \over 8} = {z \over { - 24}}\) nên \(\displaystyle\left( { - 4} \right).\left( { - 24} \right) = 8.z \)
\(\displaystyle\Rightarrow z = {{( - 4).( - 24)} \over 8} = {{96} \over 8} = 12\)
Vậy \(x=5\,;\; y = 14\,;\; z = 12.\)
