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

Toán Lớp 6: Chứng minh A= 7mũ 1 + 7 mũ 2 + 7mũ 3 + 7 mũ4 + 7mũ5 + –+ 7 mũ100 chia hết cho 8

Toán Lớp 6: Chứng minh A= 7mũ 1 + 7 mũ 2 + 7mũ 3 + 7 mũ4 + 7mũ5 + ……..+ 7 mũ100 chia hết cho 8

Comments ( 2 )

  1. 7^1 + 7 ^ 2 + 7^ 3 + 7 ^4 + 7^5 + ……..+ 7 ^100 chia hết cho 8
    = (7^1 + 7 ^ 2) + (7^ 3 + 7 ^4) + (7^5 + 7^6) ……..+( 7^99+ 7 ^100)
    =7.(1+7)+ 7^3 .(1+7) + 7^5 .(1+7) +…..+ 7^99 .(1+7) 
    =7.8+7^3.8 + 7^5 .8 + ……..+ 7^99.8
    =8.(7+7^3+7^5+…..+7^99) chia hết cho 8

  2. —-chúc tus học tốt—-
     

    toan-lop-6-chung-minh-a-7mu-1-7-mu-2-7mu-3-7-mu4-7mu5-7-mu100-chia-het-cho-8

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