Bonjour,
Calculer:
A= -4/3+(2/3+5/2)-(5- -4/6+1/2)
A= -4/3+(2/3+5/2)-(5+4/6+1/2)
A= -4/3+2/3+5/2-5-2/3-1/2
A= -4/3+4/2-5
A= -4/3+2-5
A= -4/3-3
A= -4/3-(3*3)/3
A= -13/3
B= 2-[ (1-5/3) - (-8/3+2+2/3) ] -(1/2+21/7)
B= 2-[ (1-5/3) - (-6/3+2) ] -(1/2+3)
B= 2-1+5/3+2-2-1/2-3
B= -2+5/3-1/2
B= (-2*6+5*2-1*3)/6
B= -5/6