Réponses

2014-01-23T23:58:46+01:00
B= -2/3+5/3x12/7-18x7/27
b= -2/3 +5/3* 12/7 - 18*7/27
b= -14/21 + 60/21 - 6*7/9
b = -14*9/21*9  + 60*9/21*9  - 42*21/9*21
b= - 126/189 + 540/189 - 882/189
b = -468/189
b= -52/21