Question

Tính:

\(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{5}+\dfrac{1}{7}\)

Answer 1

Thuộc toán lớp 4 à

\(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{5}+\dfrac{1}{7}\)

\(=\dfrac{105}{210}+\dfrac{70}{210}+\dfrac{42}{210}+\dfrac{30}{210}\)

\(=\dfrac{247}{210}\)

Answer 2

\(\dfrac{1}{2}\)+ \(\dfrac{1}{3}\)+ \(\dfrac{1}{5}\)+ \(\dfrac{1}{7}\)

= \(\dfrac{5}{6}\)+ \(\dfrac{12}{35}\)

= \(\dfrac{175}{210}\)+ \(\dfrac{72}{210}\)

= \(\dfrac{247}{210}\)