Tham khảo
=1/2(2/3.5 + 2/5.7 +.....+2/49.51
=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)
=1/2(1/3-1/51)
=1/2.16/51
=8/51
Tham khảo
=1/2(2/3.5 + 2/5.7 +.....+2/49.51
=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)
=1/2(1/3-1/51)
=1/2.16/51
=8/51
Tham khảo
=1/2(2/3.5 + 2/5.7 +.....+2/49.51
=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)
=1/2(1/3-1/51)
=1/2.16/51
=8/51
Tham khảo
=1/2(2/3.5 + 2/5.7 +.....+2/49.51
=1/2(1/3 - 1/5+1/5-1/7+....+1/49-1/51)
=1/2(1/3-1/51)
=1/2.16/51
=8/51
tính : A = 1/15+1/35+...+1/2499
1/15+1/35+...+1/2499
Tính: C=1/15+1/35+...+1/2499
tinh hop li
1 /15 + 1 /35 + ..... + 1 / 2499
chứng tỏ:
A, a/n.(n+a)=1/n-1/n+a
B, dựa vào câu A, tính: 1/15+1/35+...+1/2499
\(\frac{1}{3}+\frac{1}{15}+\frac{1}{35}+...+\frac{1}{2499}=?\)
thực hiện phép tính sau
M=1/3+1/15+1/35+...+1/2499
Tính ;
a ) A = 5/1*4 + 5/4*7 + 5/7*10 + ....... + 5/100*103
b) B = 1/15 + 1/35 + 1/63 + ..........+ 1/2499
tính
\(C=\frac{1}{15}+\frac{1}{35}+\frac{1}{63}+.........+\frac{1}{2499}\)