Tìm $x$, biết :

$\frac{1}{2015}.x=(1-\frac{1}{2}).(1-\frac{1}{3})...(1-\frac{1}{2014}).(1-\frac{1}{2015})$.
X=1  dễ èo 
(1/2).(2/3).(3/4)....(2013/2014).(2014/2015)=1/2015 –  ❄⊰๖ۣۜNgốc๖ۣۜ ⊱ ❄ 08-05-16 06:46 PM
chị ko bít ấn kiểu j mấy cái phân số ms dấu ý –  ❄⊰๖ۣۜNgốc๖ۣۜ ⊱ ❄ 08-05-16 06:44 PM
cách làm nữa nhé, mới có kết quả –  Hàn Thiên Dii 08-05-16 06:39 PM

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