Explicație pas cu pas:
[tex]6.5a4 + 1.4a5 = a.069 \\ 6.5a4 = 6 + 0.5 + 0.0a + 0.004 \\ 1.4a5 = 1 + 0.4 + 0.0a + 0.005 \\ 6 + 0.5 + 0.0a + 0.004 + 1 + 0.4 + 0.0a + 0.005 = \\ 7 + 0.9 + 2(0.0a) + 0.009 \\ \\ 7 + 0.9 + 2(0.0a) + 0.009 = a + 0 + 0.06 + 0.009 \\ 7.909 + 2(0.0a) =a + 0.069 \\ 7.909 + 2 \times \frac{a}{100} - a - 0.069 = \\ 7.84+ \frac{a - 50a}{50} = 0 \\ 7.84 - \frac{49a}{50} = 0 \\ \frac{49a}{50} = 7.84 \\ 49a = 392 \\ a = 8[/tex]
