11 Effectuer mentalement les calculs suivants et noter
le résultat :
a. (-1) × (-2) × (-3) × (-2) × (-1) =
b. (− 2) × (+ 2) × (− 2) × (+
(-2)x(+2)x(-2)x(+2)
2) × (- 2) = .........
c. (+5) × (+ 2) × (-4) × (− 2) × (+ 1) =
d. (-3) × (-5) × (-3) × (+2) × (-2) =.........….....
e. (-5) x(+2) × (-1) × (+ 2) × (-5) =
f. (-1)×(+2) × (-3) × (+4) × (-5) =