a,A=1/7+2/7^2+3/7^100+...+100/7^100 Chứng minh A<7/36 b,B=1/3+2/3^2+3/3^3+...+100/3^100 Chứng minh A<3/5

a,A=1/7+2/7^2+3/7^100+...+100/7^100 Chứng minh A<7/36 b,B=1/3+2/3^2+3/3^3+...+100/3^100 Chứng minh A<3/5
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