Réponses

2013-09-14T15:56:07+02:00
A =  \frac{7}{5}- \frac{3}{5}* \frac{4}{21}
= \frac{7}{5}- \frac{12}{105}
= \frac{147}{105}- \frac{12}{105}
= \frac{9}{7} <==SIMPLIFIER

B = 4-4: \frac{16}{3}
= 4 -  \frac{4}{4}* \frac{3}{16}
 \frac{4}{4}- \frac{12}{64}
= \frac{64}{64}- \frac{12}{64}
= \frac{13}{16} <== SIMPLIFIER