Đặt A=1/7+1/91+1/247+1/475+1/755+1/1147. =>A=1/1*7+1/7*13+1/13*19+1/19*25+1/25*31+1/31*37. =>6A=6/1*7+6/7*13+6/13*19+6/19*25+6/25*31+6/31*37. =>6A=1/1-1/7+1/7-1/13+1/13-1/19+1/19-1/25+1/25-1/31+1/31-1/37. =.6A=1-1/37=36/37.=>A=6/37.
Tui nghĩ là làm như Sergio Ramos đúng đấy.
Tính tổng: 1/7+1/91+1/247+1/475+1/755+1/1147+?
E = 1/7 + 1/91 + 1/247 + 1/475 + 1/ 755 + 1/ 1147
tính tổng nha
Tính tổng :
\(\frac{1}{7}+\frac{1}{91}+\frac{1}{247}+\frac{1}{475}+\frac{1}{755}+\frac{1}{1147}\)
tính D = 1/7 + 1/91 + 1/247 + 1/475 + 1/775 + 1/1147
\(\dfrac{1}{7}+\dfrac{1}{91}+\dfrac{1}{247}+\dfrac{1}{475}+\dfrac{1}{775}+\dfrac{1}{1147}\)
Tính
1\7+1\91+1\247+1\475+1\775+1\1147
thực hiện phép tính hợp lí nếu có thể
1/7+1/91+1/247+1/475+1/775+1/1147
Bài 1 : TÍnh Tổng
\(\frac{1}{7}+\frac{1}{91}+\frac{1}{247}+\frac{1}{475}+\frac{1}{775}+\frac{1}{1147}\)
\(A=\frac{1}{7}+\frac{1}{91}+\frac{1}{247}+\frac{1}{475}+\frac{1}{775}+\frac{1}{1147}\) = ?
