Bonjour,
17+3-1÷8÷√2×9 = 19.4696699141
[tex]17 + 3 - 1 / 8 / \sqrt{2} * 9[/tex]
[tex]= 17 + 3 - \frac{1}{8} / 9\sqrt{2}[/tex]
[tex]= 17 + 3 - \frac{\frac{1}{8}}{9\sqrt{2}}[/tex]
[tex]= 20 - \frac{\frac{1}{8}}{9\sqrt{2}}[/tex]
[tex]= \frac{180\sqrt{2}}{9\sqrt{2}} - \frac{\frac{1}{8}}{9\sqrt{2}}[/tex]
[tex]= \frac{180\sqrt{2} - \frac{1}{8}}{9\sqrt{2}}[/tex]