= 2/ 1x3 +2/ 3x5 +2/ 5x7 + 2/ 7 x9+............+2/2011 x 2003 +2 / 2003 x 2005
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Các câu hỏi tương tự
a,( 1- dfrac{1}{3})x(1-dfrac{2}{5})x(1-dfrac{2}{7})x(1-dfrac{2}{9})b,dfrac{1}{1x3} + dfrac{1}{3x5} + dfrac{1}{5x7} + dfrac{1}{7x9}
Đọc tiếp
a,\((\) 1\(-\) \(\dfrac{1}{3}\)\()\)x\((\)1\(-\)\(\dfrac{2}{5}\)\()\)x\((\)1\(-\)\(\dfrac{2}{7}\)\()\)x\((\)1\(-\)\(\dfrac{2}{9}\)\()\)
b,\(\dfrac{1}{1x3}\) + \(\dfrac{1}{3x5}\) + \(\dfrac{1}{5x7}\) + \(\dfrac{1}{7x9}\)
a=2/1x3+2/3x5+2/5x7+............+2/13x15
Tính nhanh
2 / 1 x 3 + 2 / 3 x 5 + 2 /5 x 7 +2 / 7 x 9 + ..............+ 2 / 2001 x 2003 +2 / 2003 x 2005
2/1x3+2/3x5+2/5x7+.....+2/41x43
tính nhanh các tổng sau
a, 2/1x3 + 2/3x5 + 2/5x7 + ... + 2/99x101
2/1x3+2/3x5+2/5x7+.......+2/41x43
2/1x3+2/3x5+2/5x7+2/7x9+2/9x1+2/11x13
Tính : B = 2/1x3 + 2/3x5 + 2/5x7 + 2/7x9 + ..... + 2/99x101
\(\dfrac{2}{1x3} + \dfrac{2}{3x5} + \dfrac{2}{5x7} + \dfrac{2}{7x9} + \dfrac{2}{9x11}\)