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	2	thêm 12 ký tự trong đáp án		Sửa 15-05-16 12:32 PM Ngọc 1
$A=13.15+15.17+17.19+...+2015.2017$$=14^2-1+16^2-1+18^2-1+....+2016^2-1$$=(14^2+16^2+18^2+...+2016^2)-1002$$=4(7^2+8^2+9^2+....+1008^2)-1002$$=(4.1008.1009.2017)/6-(4.6.7.13)/6-1002$$=1367621450 $ A=13.15+15.17+17.19+...+2015.2017=14^2-1+16^2-1+18^2-1+....+2016^2-1=(14^2+16^2+18^2+...+2016^2)-1002=4(7^2+8^2+9^2+....+1008^2)-1002=(4.1008.1009.2017)/6-(4.6.7.13)/6-1002=1367621450 $A=13.15+15.17+17.19+...+2015.2017$$=14^2-1+16^2-1+18^2-1+....+2016^2-1$$=(14^2+16^2+18^2+...+2016^2)-1002$$=4(7^2+8^2+9^2+....+1008^2)-1002$$=(4.1008.1009.2017)/6-(4.6.7.13)/6-1002$$=1367621450 $

	1	tạo mới		Trả lời 15-05-16 11:56 AM ❄⊰๖ۣۜNgốc๖ۣۜ ⊱ ❄ 1
A=13.15+15.17+17.19+...+2015.2017=14^2-1+16^2-1+18^2-1+....+2016^2-1=(14^2+16^2+18^2+...+2016^2)-1002=4(7^2+8^2+9^2+....+1008^2)-1002=(4.1008.1009.2017)/6-(4.6.7.13)/6-1002=1367621450

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