Question

Tinh nhanh : 2155- (174 + 2155) + (- 68 +174)

Answer 1

2155- (174 + 2155) + (- 68 +174)

=2155-174-2155-68+174

=(2155-2155)+(-174+174)-68

=0+0-68

=-68

Answer 2

= 2155 - 174 - 2155 - 68 +174

= ( 2155 - 2155) + ( -174 + 174) - 68

= 0+ 0 - 68

= -68

Answer 3

2155 - (174 + 2155) + (-68 + 174)

= 2155 - 174 - 2155 - 68 +174

= -68

Answer 4

2155 - (174 + 2155) + (-68 + 174)

= 2155 - 174 - 2155 - 68 + 174

= (2155 - 2155) + (-174 + 174) -68

= 0 - 68

= - 68

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