2155 - ( 174 + 2155) + (-68 + 174)
= 2155 - 2329 + 106
= -174 + 106
= -68
Ta có: 2155 - (174 + 2155) + (-68 + 174)
= 2155 - 174 - 2155 + (-68) + 174
= (2155 - 2155) - 174 + 174 + (-68)
= 0 + 0 + (-68)
= -68
= 2155 - 174 - 2155 - 68 +174
= (2155 - 2155) + (174 - 174) - 68
= 0 + 0 - 68
= - 68
2155 - ( 174 + 2155) + (-68 + 174)=2155-174-2155-68+174
=(2155-2155)+(174-174)-68
=0+0-68
=0-68
=-68
2155 - ( 174 + 2155) + (-68 + 174)=2155-174-2155-68+174
=(2155-2155)+(174-174)-68
=0+0-68
=0-68
=-68
=(2155-2155)+(174+174)+(-68)
= 0+ 0 + (-68)
=-68
CHÚC BN HỌC GIỎI
