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

Toán Lớp 6: Cho B= 3 mũ 1 + 3 mũ 2 + 3 mũ 3 + -. + 3 mũ 100 Chứng minh B chia hết cho 2

Toán Lớp 6: Cho B= 3 mũ 1 + 3 mũ 2 + 3 mũ 3 + ….. + 3 mũ 100
Chứng minh B chia hết cho 2

Comments ( 1 )

  1. $B=3^{1}$+ $3^{2}$+ $3^{3}+…+$ $3^{100}$ 
    B=($3^{1}+$ $3^{2})+$ ($3^{3}+$ $3^{3})+…+$ $(3^{99}$ + $3^{100})$
    B=$3^{1}.$ $(1+3^{})$+ $3^{3}$. ($1+3^{}$) + …+ $3^{99}$. ($1+3^{}$)
    B = $3.^{1}$ $4^{}$ + $3^{3}$ . $4^{}$ + … +$3^{99}$ . $4^{}$ 
    B= $4.^{}$ ($3^{1}+$ $3^{3}.4$ + …+ $3^{99})$ 
    B = $2.2.(3^{1}$ + $3^{3}$+…+ $3^{99})$ ⋮ $2^{}$ ( $đpcm^{})$ 

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