Exercice 2)
A = (3-7)[-6+3x(-5)]=(-4)(-6-15)=(-4)(-21)=84
B=(-12x(-1)^2013)(((-1)^2014 - 2x3) -(-10) = 12 x -5 + 10 = -60 + 10 = -50
C=3^2 x (2x(-20))/(4-9) = 9 x (-4/-5) - (-1) = 9 x 40/5 + 1 = 360/5 + 1 = 365/5 = 73
D= -2^2 x (-2)^4 : (-5) = -4 x 16 : (-5) = 65 : 5 = 13
