d) – (- 45) + 120 – 45 + (- 20)=???

2 bình luận về “d) – (- 45) + 120 – 45 + (- 20)=???”

1. d) – (-45) + 120 – 45 + (-20)

   = 45 + 120 – 45 – 20

   = (45 – 45) + (120 – 20)

   = 0 + 100

   = 100

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2. d) – (- 45) + 120 – 45 + (- 20)=???

   = 45+120-45+(-20)

   = 165-45+(-20)

   = 120+(-20)

   = 100

    

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