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cho day so 53,56,59,62,65,...tim so hang thu 1010 cua day so
Cho day so 53 ; 56 ; 59 ;62 ; 65 ; ........ Tim so hang thu 1010 cua day.
cho day so 5, 10, 15, 20, ...tim so hang thu 125 cua day so do
cho day so 2;12;30;56;..;462.tim so hang thu 2011.
Tim so hang thu 2015 cua day so 3, 6,9,12...
Cho day so:5,21,53,101,165.....
A.So 23765 la so hang thu may cua day ?
B.So hang thu 87cua day la so nao ?
Cho day so cách đều 3 co 30 so hang biết rang tong cua 30 so hang do bang 1605 tim day so da cho
tim so hang thu 15 cua day so:
a. 1;4;9;16;...
b. 1;9;25;...
so hang thu 100 cua day so : 2 , 6, 12 , 12 , 20 , 30 , ... la so ...