Tính tổng sau bằng cách hợp lí nhất :
$\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}+\frac{1}{9.10}+\frac{1}{10.11}$

bài lớp 4 –  Hàn Thiên Dii 10-03-16 06:33 PM
chị nhớ k nhầm thì em up bài này 4-5 lần r -__- –  ☼SunShine❤️ 10-03-16 06:30 PM
....=1617+1718+...+110111

đung lớp 4 chưa –  Lionel Messi 10-03-16 07:34 PM
$...=\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}+...+\frac{1}{10}-\frac{1}{11}$
$=\frac{1}{6}-\frac{1}{11}=\frac{11-6}{6.11}=\frac{5}{66}$

trước cái 1/6-1/11 là gì ? –  Hàn Thiên Dii 10-03-16 06:32 PM
đúng click "V"chấp nhận đúng và vote up cho anh –  ๖ۣۜJinღ๖ۣۜKaido 10-03-16 06:19 PM

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