bonjour
A = ( - 13 - 5 ) / 3 - 4
A = -18/3 - 4
A = - 6 - 4 = - 10
B =[ ( - 5 ) x ( 4 - 6 )] / ( - 2 - 8 )
B = ( - 5 * - 2 ) / - 10
B = 10 / - 10 = - 1
C = ( 1 - 1 /5 ) : ( 1 + 1 /5 )
C = ( 5/5 - 1 /5 ) : ( 5/5 + 1 /5 )
C = 4 /5 ; 6 /5
C = 4/5 x 5 /6
C = 20 /30 = 2 /3
