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

Toán Lớp 6: Tính : S = 2 + 4 + ( -6 ) + 8 + … + ( -18 )

Toán Lớp 6: Tính :
S = 2 + 4 + ( -6 ) + 8 + … + ( -18 )

Comments ( 1 )

  1. S = 2 + 4 + (-6) + 8 + … + (-18)
    => S = 2 + [4 + (-6)] + [8 + (-10)] + [12 + (-14)] + [16 + (-18)]
    => S = 2 + (-2) + ( -2) + (-2)+ (-2)
    => S = 2 + (-2) . 4
    => S = 2 + (-8)
    => S = -6
    Vậy S = -6
    #dtkc

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

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