a)1/2+1/2^2+1/2^3+1/2^4+……..+1/2^n <1 b)1/2^2+1/3^2+1/4^2+ ... +1/10^2 <1

a)1/2+1/2^2+1/2^3+1/2^4+……..+1/2^n <1 b)1/2^2+1/3^2+1/4^2+ ... +1/10^2 <1

0 bình luận về “a)1/2+1/2^2+1/2^3+1/2^4+……..+1/2^n <1 b)1/2^2+1/3^2+1/4^2+ ... +1/10^2 <1”

  1. b) 1/2^2+1/3^2+…+1/10^2<1

    1/2^2+1/3^2+…+1/10^2<1/1*2+1/2*3+1/3*4+…+1/9*10

                                             <1/1-1/2+1/2-1/3+1/3-1/4+…+1/9-1/10

                                             <1/1-1/10

                                             <9/10<1

    =>1/2^2+1/3^2+…+1/10^2<1

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