2/3.5+ 2 /5.7+ 2/7.9+...+ 2/97.99
=1/3-1/5+1/5-1/7+1/7-1/9+....+1/97-1/99
=1/3-1/99
=32/99
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2/3.5+ 2 /5.7+ 2/7.9+...+ 2/97.99
=1/3-1/5+1/5-1/7+1/7-1/9+....+1/97-1/99
=1/3-1/99
=32/99
các bạn cho mk hỏi câu này
2/3.5+2/5.7+2/7.9+...+2/97.99
thì mk sẽ viết thành
1/3.5+1/5.7+1/7.9+...+1/97.99
hay
2.(1/3.5+1/5.7+1/7.9+...+1/97.99)
giúp mk với
2/3.5 + 2/5.7 +...+ 2/97.99
2/3.5 + 2/5.7 + 2/7.9 + ... + 2/97.99 = ?
M=2/3.5 + 2/5.7+2/7.9 +....+ 2/97.99 =?
g=1.3^2+3.5^2+5.7^2+...+97.99^2
k) (2 ^ 2)/3.5 + (2 ^ 2)/5.7 + (2 ^ 2)/7.9 +...+ 2^ 2 97.99
Cho A =2/1.3+2/3.5+2/5.7+2/7.9+....2/97.99
Tinh NHANH
m = 2/3.5+2/5.7+2/7.9+.....+2/97.99
B= \(\dfrac{2}{1.3}\) + \(\dfrac{2}{3.5}\) +\(\dfrac{2}{5.7}\) +...+ \(\dfrac{2}{97.99}\) + \(\dfrac{2}{99.101}\)