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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Giúp với tối nay nộp rồi . -1+2+(-3)+4+(-5)+-+98+(-99)

Toán Lớp 6: Giúp với tối nay nộp rồi .
-1+2+(-3)+4+(-5)+….+98+(-99)

Comments ( 2 )

  1. -1 + 2 + ( -3 ) + 4 + (-5) + … + 98 + ( – 99)
    = [-1 + (-99)] + (2 + 98) + [-3 + (-97)] + … + [-49 + (-51)] + 50
    = -100 + 100 + (-100) + … + (-100) + 50
    = -100 + 50 = -50

  2. -1 + 2 + (-3) + 4 + (-5) + …. + 98 + (-99)
    = [(-1) + (-99)] + (2 + 98) + [(-3) + (-97)] + ….. + 50
    = (-100) + 100 + (-100) + ….. + (-100) + 50
    = -100 + 50
    = -50
     

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222-9+11+12:2*14+14 = ? ( )

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