Các câu hỏi tương tự
1) A = 7/ 10.11 + 7/ 11.12 + 7/ 12.13 + .... + 7/69.70
2 ) B = 1/ 25.27 + 1/ 27.29 + 1/29.31+ ......+ 1/ 73.75
Bài 6: Tính các tổng sau:
A= \(\dfrac{7}{10.11}\)+\(\dfrac{7}{11.12}\)+\(\dfrac{7}{12.13}\)+...+\(\dfrac{7}{69.70}\)
B= \(\dfrac{1}{25.27}\)+\(\dfrac{1}{27.29}\)+\(\dfrac{1}{29.31}\)+...+\(\dfrac{1}{73.75}\)
Tính nhanh
1)A=\(\frac{7}{10.11}+\frac{7}{11.12}+\frac{7}{12.13}+...+\frac{7}{69.70}\)
2)B=\(\frac{1}{25.27}+\frac{1}{27.29}+\frac{1}{29.31}+...+\frac{1}{73.75}\)
3)C=\(\frac{4}{2.4}+\frac{4}{4.6}+\frac{4}{6.8}+...+\frac{4}{2008.2010}\)
tính tổnga, Afrac{7}{10.11}+frac{7}{11.12}+frac{7}{12.13}+.......+frac{7}{69.70}b, Bfrac{1}{25.27}+frac{1}{27.29}+frac{1}{29.31}+.........+frac{1}{73.75}c, Cfrac{4}{2.4}+frac{4}{4.6}+frac{4}{6.8}+.............+frac{4}{2008.2010}
Đọc tiếp
tính tổng
a, A=\(\frac{7}{10.11}\)+\(\frac{7}{11.12}\)+\(\frac{7}{12.13}\)+.......+\(\frac{7}{69.70}\)
b, B=\(\frac{1}{25.27}\)+\(\frac{1}{27.29}\)+\(\frac{1}{29.31}\)+.........+\(\frac{1}{73.75}\)
c, C=\(\frac{4}{2.4}\)+\(\frac{4}{4.6}\)+\(\frac{4}{6.8}\)+.............+\(\frac{4}{2008.2010}\)
tính:
1/25.27+1/27.29+1/29.31+...+1/73.75
4/2.4 + 4/4.6 +4/6.8 +...+ 4/2008.2010
Tính:
\(A=\frac{1}{25.27}+\frac{1}{27.29}+\frac{1}{29.31}+...+\frac{1}{73.75}\)
A=15/90.94+15/94.98+15/98.102+....+15/146.150
B=10/56+10/140+10/260+...+10/1400
C=1/25.27+1/27.29+1/29.31+.....+1/73.75
B=1/25.27+1/27.29+1/29.31+......+1/73.75
F=4/2.3+4/4.6+4/6.8+.....+4/2008.2010
Tính tổng đó nha các bạn