BONJOUR QUI PEUT M' AIDER A FAIRE MON DM DE MATH: On donne r= 4/3, s= -2, t= - ¼. Calculer ces expressions: 1) r+ s- t 2) -r+ 2s- (-t) 3) -[(t- r)- s] MERCI

bonjour

1) 4/3 - 2 + 1/4 = 16/12 - 24/12 + 3/12 = - 5/12

2) - 4/3  - 4 + 1/4 = - 16/12 - 48/12 + 3/12 = -61/12

3) - ( - 1/4 - 4/3) + 2 = - ( - 3/12 - 16/12) + 2 = 3/12 + 16/12 + 24/12 = 43/12

bonsoir


1) r+ s- t= 4/3 +(-2) -(-1/4) =4/3-2+1/4 =16/12-24/12+3/12 = 19/12-24/12 = -5/12

2) -r+ 2s- (-t) = -4/3 +2(-2) -(- -1/4) = -4/3-4-(+1/4) = -4/3-4+-1/4 = -16/12-48/12-3/12= - 67/12

3) -[(t- r)- s] = -[(-1/4-4/3) - -2] = -[(-3/12-16/12) +2] = -[(-19/12) +2] =
-(-19/12+24/12) =-(5/12) = -5/12