\(=\frac{5}{3}.\left(\frac{3}{1.4}+\frac{3}{4.7}+...+\frac{3}{100.103}\right)\)
\(=\frac{5}{3}.\left(1-\frac{1}{4}+\frac{1}{4}-\frac{1}{7}+...+\frac{1}{100}-\frac{1}{103}\right)\)
\(=\frac{5}{3}.\left(1-\frac{1}{103}\right)\)
\(=\frac{5}{3}.\frac{102}{103}\)
\(=\frac{170}{103}\)
\(B=\dfrac{5}{1.4}+\dfrac{5}{4.7}+...+\dfrac{1}{100.103}\)
\(\frac{5}{1.4}+\frac{5}{4.7}+.....+\frac{5}{100.103}\)
tính và so sánh: A=1/2.3+1/3.4+...+1/99.100 ; B=5/1.4+5/4.7+...+5/100.103
tính
a) P = 1 / 1.2 + 2 / 2.4 + 3 / 4.7 + ...+ 10 / 46.56
b) A= 3 / 1.2 + 3 / 2.3 + 3 / 3.4 + ....+ 3 / 99.100 chú ý : / là phần nha
c) B = 3 / 1.4 + 3 / 4.7 + 3 / 7.10 + ... + 3 / 100.103
d) C= 5 / 1.4 + 5 / 4.7 + 5 / 7.10 + ...+ 5 / 100.103
e) D= 7 / 1.5 + 7 / 5.9 + 7 / 9.13 +...+ 7 / 101.105
\(S=\frac{5}{1.4}+\frac{5}{4.7}+...+\frac{5}{100.103}=?\)
Tính: B=5/1.4+5/4.7+...+5/100.103
D=5^2/1.6+5^2/6.11+...5^2/36.41
tính nhanh:
\(\frac{5}{1.4}+\frac{5}{4.7}+\frac{5}{7.10}+.........+\frac{5}{100.103}\)
tính giá trị biểu thức
C=1/15+1/35+.................+1/2499
B=5/1.4+5/4.7+...................5/100.103
A=1/2.3+1/3.4+...+1/99.100
B+5/1.4+5/4.7+...+5/100.103
C=4/2.4+4/4.6+4/6.8+....+4/2008.2010
