Bài 1:
1.1) (-51 + |2017|) - (2017 - |-51| - 2018)
= (-51) + 2017 - 2017 + 51 + 2018
= [(-51) + 51] + (2017 - 2017) +2018
= 0 + 0 + 2018
= 2018
1.2) (-71 + |18|) -(18 - |-71| - 2018)
= (-71) + 18 - 18 + 71 +2018
= [(-71) + 71) + (18 -18) + 2018
= 0 +0 + 2018
1.3) (|-5| - 12 - 2018^0) - (5 - |+12|)
= 5 - 12 -1 - 5 + 12
= 1
1.4) [(-405) - |-208|) - (-405 - |+208| - 2018)
= (-405) - 208 + 405 + 208 + 2018
= 2018
1.5) [(-125) + |106|] - (106 - |125| - 2017)
= (-125) + 106 - 106 + 125 + 2017
= [(-125 + 125) + (106 - 106) + 2017
= 0 + 0 + 2017
= 2017
1.6) 25% - (0,75 + 2\1\4) + 2017^0
= 1/4 - 3/4 - 9/4 + 1
= -11/4 + 1
= -7/4
1.7) -75% . 2018^0 - (2,25 + 3/3/4) : (-2)^3
= -3/4 . 1 - (9/4 + 15/4) : (-8)
= -3/4 - 6 : (-8)
= -3/4 - -3/4
= 0
1.8) 75% - (0.25 + 8/1/2) + 2018^0
= 3/4 - (1/4 + 17/2) + 1
= 3/4 - (1/4 + 34/4) + 1
= 3/4 - 35/4 + 1
= -8 + 1
=7
Xin 5* ạ
