Các câu hỏi tương tự
Cho A =2/1.3+2/3.5+2/5.7+2/7.9+....2/97.99
B= \(\dfrac{2}{1.3}\) + \(\dfrac{2}{3.5}\) +\(\dfrac{2}{5.7}\) +...+ \(\dfrac{2}{97.99}\) + \(\dfrac{2}{99.101}\)
Tính nhanh
B=3^2/1.3+3^2/3.5+3^2/5.7+...+3^2/95.97+3^2/97.99
Tính A=\(1.3^2+3.5^2+5.7^2+...+97.99^2\)
1. TÝnh B = 1.3^2 + 3.5^2 + 5.7^2 + … + 97.99^2
2 C = 1.3.5 – 3.5.7 + 5.7.9 – 7.9.11 + … - 97.99.101
\(A=\frac{2}{1.3}+\frac{2}{3.5}+\frac{2}{5.7}+\frac{2}{7.6}+...+\frac{2}{97.99}\)
Tính :
A=1.32+3.52+5.72+...+97.992
Tính Nhanh \(1.3^2+3.5^2+5.7^2+...+97.99^2\)
Tính B=1.32+3.52+5.72+....+97.992