=1/3-1/5+1/5-1/7+1/7-1/9+....+1/97-1/99
= 1/3 -1/99
=32/99
tích cho mình nha
=1/3-1/5+1/7-1/7+1/9-1/9+...+1/97-1/99
=1/3-1/99
=32/99
Tính S = \(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+.....+\frac{1}{97.99}\)
Tính nhanh :
\(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+....+\frac{2}{95.97}+\frac{2}{97.99}\)
Tính:
\(a,\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}+\frac{1}{90}+\frac{1}{110}+\frac{1}{132}\)
\(b,\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+....+\frac{2}{97.99}\)
Tính nhanh
M = \(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+.......+\frac{2}{97.99}\)
1) Thực hiện phép tính:
a/ \(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+\frac{1}{9.11}+....+\frac{1}{97.99}\)
b/ (\(\frac{201}{202}-\frac{206}{207}+\frac{21}{199}\)) . (\(\frac{1}{3}-\frac{1}{4}-\frac{1}{12}\))
Tính nhanh tổng sau:\(\frac{1}{3.5}+\frac{1}{5.7}+\frac{1}{7.9}+...+\frac{1}{87.89}\)
Tính nhanh:
M= \(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{97.99}\)
Giúp mình với!
tính
M = \(\frac{1}{3.5}+\frac{1}{5.7}+....+\frac{1}{97.99}\)
ai nhanh mk tick
Tính
M = \(\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.9}+...+\frac{2}{97.99}\)
