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

Toán Lớp 6: N=1+3+3^2+3^4+…+3^100 P=1+5^3+5^6+-+5^99

Toán Lớp 6: N=1+3+3^2+3^4+…+3^100
P=1+5^3+5^6+….+5^99

Comments ( 2 )

  1. Sửa đề: N=1+3+3^2+3^3+…+3^100
    text{Giải đáp + Lời giải và giải thích chi tiết}
    text{_________________________________________________}
    text{Ta có:}
    N=1+3+3^2+3^3+…+3^100
    =>3N=3+3^2+3^3+3^4+…3^101
    3N-N=3+3^2+3^4+3^6+…3^101 -1-3-3^2-3^3-…-3^100
    2N=3^101-1
    =>N=(3^101-1)/2
    text{__________________________________________________}
    text{Ta có:}
    P=1+5^3+5^6+…+5^99
    5^3 P=5^3+5^6+5^9+…+5^102
    5^3 P-P=5^3+5^6+5^9+…+5^102-1-5^3-5^6-…-5^99
    =>124P=5^102-1
    =>P=(5^102-1)/124
     
     

  2. gửi tuss ak!
    N=1+3+3^2+3^4+…+3^100
    3N=3+3^2+3^4+3^6+….3^102
    3N-N=(3+3^2+3^4+3^6+….3^102 )-(1+3+3^2+3^4+…+3^100)
    2N=3^102-1/2
    P=1+5^3+5^6+….+5^99
    5P=5^3+5^6+5^9+…..+5^102
    5P-P=(5^3+5^6+5^9+…..+5^102)-(1+5^3+5^6+….+5^99)
    4P= 5^102-1/4
     

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