Question

[Apple Nguyễn]

Thực hiện phép tính

\(\frac{5}{1.3}-\frac{5}{3.5}+--\frac{5}{5.7}-...-\frac{5}{99.101}\)

\(\frac{5}{1.4}+\frac{5}{4.7}+...+\frac{5}{100.103}\)

Answer 1

[ngonhuminh]

a cong tru loan nen ko hieu

b

A=5/1.4+5/4.7+..5/100.103

3/5.A=3/1.4+3/4.7+..+3/100.103

=1/1-1/4+1/4-1/7+...+1/100-1/103

=1-1/103=102/103

A=(5.102)/(3.103)=5.34/103