Sagot :
A = -17+(-8) = -17-8 = -25
B = -7.5 -(11-8.5) = -7.5 +2.5 = -5
C = 13+42 = 55
D = -4*9/-8 = -36/-8 = 4.5
2)
A 3*5 = 15 donc opposé = -15
B +15-7 = 8 don copposé = -8
C = (-4)*(-7-2+6) = -4*-3 = 12 opposé = -12
D = (-25+15)/5 = -10/5 = -2 opposé = +2