Question

Operatii cu numere rationale :
a) (3-9+11-72)+(-9+3) = ___________
b) (2-53)-(-41+79)= ____________
c) (13-20-10)-(14+7) = __________

Answer 1

$a) (3-9+11-72)+(-9+3) = \\ =(-6+11-72)+(-6)= \\ =(5-72)+(-6)= \\ =-67+(-6)= \\ =-73 \\ b). (2-53)-(-41+79)= \\ =-51-38= \\ = -89 \\ c). (13-20-10)-(14+7) = \\ =(-7-10)-21= \\ =-17-21= \\ =-38$