effectuer le calcul sous forme de fractions irréductibles C=-11/36-51/56*14/17

- 11/36 - 51/56 * 14/17
= - 11/36 - (17*3)/(4*14) * 14/17
= - 11/36 - 3/4
= - 11/36 - (9*3)/(9*4)
= - 11/36 - 27/36
= - 38/36
= - 19/18