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

Toán Lớp 6: Cho S1 =1 S2=2+3 S3=4+5+6 … Em hãy tính S50

Toán Lớp 6: Cho S1 =1
S2=2+3
S3=4+5+6
…
Em hãy tính S50

Comments ( 1 )

  1. Ta có: 
    S_1 = 1
    S_2 = 2+3
    S_3 = 4+5+6
    …
    => S_50 = 51+52+53+…+101
    Tổng là: (51 + 101) xx 50 : 2 = 3800
    Vậy S_50 = 3800
     

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

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