a) 35/63 + 2/27 - 51/34
== 5/9 + 2/27 - 3/2 or ppcm ( 9, 27, 2) = 54 d´ou
== 30/54 + 4/54 - 81/54
== -47/54
b) 5R27/R75
== 15R3 / 5R3
== 15/5
== 3
c) R96 x R50 / R147
== 4R6 * 5R2 / 7R3
== 4 * 5 * R12 / 7R3
== 4 * 5 * 2R3 / 7R3
== 40R3 / 7R3
== 40 / 7
d) R288 + R162 / R98
C´est ( R288 + R162 ) / R98 OU
R288 + ( R162 / R98) ? ???
Dans le premier cas:
( R288 + R162) / R98
== ( 12R2 + 9R2) / R98
== ( 21R2) / 7R2
== 21/7
== 3
Deuxieme cas:
R288 + ( R162 / R98)
== 12R2 + ( 9R2/7R2)
== 12R2 + 9/7
Voila...