a) [(−8)+(−7)]+(−10)[(−8)+(−7)]+(−10)
= (−15)+(−10)=−25(−15)+(−10)=−25
b) 555−(−333)−100−80555−(−333)−100−80
= (555+333)−(100+80)(555+333)−(100+80)
= 888 – 180 = 708
c) -(-229) + (-219) – 401 + 12
= (229 – 219) – (401 – 12)
= 10 – 389 = - 379
d) 300 – (-200) – (-120) +18
= (300 + 200) + (120 + 18)
= 500 + 138 = 638
chúc bn hok tốt !