1) ( 2016 . 2016 - 2013 . 2009 ) . X = 18
( 4064256 - 4044117 ) . X = 18
0 . X = 18
X = 18 : 0
X = \(\varnothing\)
Vậy X = \(\varnothing\)
2) ( \(\frac{1}{3}\) + \(\frac{1}{9}\) + \(\frac{1}{27}\) + \(\frac{1}{81}\) + \(\frac{1}{243}\) ) . X = \(\frac{2}{3}\)
\(\frac{121}{243}\) . X = \(\frac{2}{3}\)
X = \(\frac{2}{3}\) : \(\frac{121}{243}\)
X = \(\frac{162}{121}\)
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