Réponse:
a)
A= (2×0,5 -1)(5×0,5 +3)
A= (1-1)(2,5+3)
A= 0×5,5
A= 0
b)
A= (2×4-1)(5×4+3)
A= (8-1)(20+3)
A= 7×23
A= 161
c)
A= (2×(-4) -1)(5×(-4) +3)
A= (-8-1)(-20+3)
A= -9 × -17
A= 153
d)
A= (2×(-0,5) -1)(5×(-0,5) +3)
A= (-1 -1)(-2,5 +3)
A= -2 × 0,5
A= -1
e)
A= (2×1/3 -1)(5×1/3 +3)
A= (2/3 -1)(5/3 +3)
A= (2/3 -3/3)(5/3 + 9/3)
A= -1/3 × 14/3
A= -14/9
f)
A= (2×(-3/5) -1)(5×(-3/5) +3)
A= (-6/5 -1)(-3 +3)
A= (-6/5 -5/5) × 0
A= -11/5 × 0
A= 0
