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การบวกจำนวนเต็ม

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    0
  • 20+(-5)
    15
  • (-34)+1
    -33
  • (-11)+(-3)
    -14
  • (-9)+20
    11
  • -19+(-4)
    -23
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    -20
  • 99+(-99)
    0
  • (-50)+40
    -10
  • 5+33
    38
  • (-11)+15
    4
  • (-1)+(-9)
    -10
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    -50
  • 15+(-15)
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