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

Toán Lớp 6: Chứng tỏ M=5+5^2+5^2+5^3+5^4+-.+5^99+5^100 chia hết cho 6

Toán Lớp 6: Chứng tỏ M=5+5^2+5^2+5^3+5^4+…..+5^99+5^100 chia hết cho 6

Comments ( 1 )

  1. M=5+5^2+5^3+5^4+……………………+5^99+5^100
    M=(5+5^2)+(5^3+5^4)+…………………………+(5^99+5^100)
    M=5.(1+5)+5^3.(1+5)+……………………….+5^99.(1+5)
    M=5.6+5^3. 6+…………………..+5^99. 6
    M=6.(5+5^3+………………………+5^99)
    Vì 6vdots6
    =>Mvdots6
    Vậy Mvdots6
    @Ki ng  
     

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

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