Các câu hỏi tương tự
Tinh nhanh:
S = 2/5.7 + 2/7.9+ 2/9.11+...+2/93.95
tinh nhanh:s=2/5.7+2/7.9+2/9.11+...+2/93.95+3/95.98+4/98.102+5/102.107+2012/107.2119
S= 2/5.7 + 2/7.9 + 2/9.11 + .... + 2/93.95 + 3/95.98 + 4/98.102 + 5/102.107 + 2012/107.2119
Mình cần gấp lắm ! Trước 8h mình phải nộp bài cho cô giáo rồi. Giúp mình nha thanks
Tính:
a) M=2/3.5+2/5.7+2/7.9+...+2/97.99
b) N=3/5.7+3/7.9+3/9.11+...+3/197.199
4/5.7+4/7.9+4/9.11+...+4/53.55 = ?
11/5.7+11/7.9+11/9.11+......+11/59.61
3/5.7+3/7.9+3/9.11+...3/59.61
\(\dfrac{2}{3.5}+\dfrac{2}{5.7}\dfrac{2}{7.9}+.........+\dfrac{2}{99.101}\)
\(P=\dfrac{2}{3.5}+\dfrac{2}{5.7}+\dfrac{2}{7.9}+\dfrac{2}{9.11}+\dfrac{2}{11.13}+\dfrac{2}{13.15}\)
N = 3/5.7 + 3/7.9 + 3/9.11 +.....+3/197.199