1/1 x 3 + 1/3 x 5 + 1/5 x 7 + 1/7 x 9 + 1/9 x 11
= 1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + 1/7 - 1/9 + 1/9 - 1/11
= 1 - 1/11
= 10/11
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Các câu hỏi tương tự
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11 = ?
(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13)xy=3/5
tìm y:(1/1x3+1/3x5+1/5x7+1/7x9+1/9x11)xy=2/3
\(\left(\frac{1}{1x3}+\frac{1}{3x5}+\frac{1}{5x7}+\frac{1}{7x9}+\frac{1}{9x11}\right)\)
tìm y ( 1/1x3 + 1/3x5 + 1/5x7 + 1/7x9 + 1/9x11 ) xy = 2/3
nhanh hộ tớ nhé chiều nay tớ phải nộp
Tính
\(\frac{1}{1x3}+\frac{1}{3x5}+\frac{1}{5x7}+\frac{1}{7x9}+\frac{1}{9x11}\)
2/1x3 + 2/3x5 + 2/5x7 + 2/7x9 + 2/9x11
1/3x5+1/5x7+1/7x9+1/9x11+1/11x13
1/1x3 + 1/3x5 + 1/5x7 + 1/7x9