Question

Tính A= \(\frac{1}{3.7}+\frac{1}{7.14}+\frac{1}{14.21}+...+\frac{1}{140.150}\)

Answer 1

A =\(\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{14}+\frac{1}{14}-\frac{1}{21}+...+\frac{1}{140}-\frac{1}{150}\)

A=\(\left(\frac{1}{3}-\frac{1}{150}\right)\)

A=\(\left(\frac{50}{150}-\frac{1}{150}\right)\)

A=\(\frac{49}{150}\)

Answer 2

\(A=\frac{1}{3x7}+\frac{1}{7x14}+....+\frac{1}{140x150}\)

\(A=\frac{1}{3}-\frac{1}{7}+.....+\frac{1}{140}-\frac{1}{150}\)

\(A=\frac{1}{3}-\frac{1}{150}\)

\(A=\frac{49}{150}\)

Answer 3

\(A=\frac{1}{3x7}+\frac{1}{7x14}+....+\frac{1}{140x150}\)

\(A=\frac{1}{3}-\frac{1}{7}+.....+\frac{1}{140}-\frac{1}{150}\)

\(A=\frac{1}{3}-\frac{1}{150}\)

\(A=\frac{49}{150}\)

Answer 4

\(A=\frac{1}{3x7}+\frac{1}{7x14}+....+\frac{1}{140x150}\)

\(A=\frac{1}{3}-\frac{1}{7}+.....+\frac{1}{140}-\frac{1}{150}\)

\(A=\frac{1}{3}-\frac{1}{150}\)

\(A=\frac{49}{150}\)

Answer 5

\(A=\frac{1}{3x7}+\frac{1}{7x14}+....+\frac{1}{140x150}\)

\(A=\frac{1}{3}-\frac{1}{7}+.....+\frac{1}{140}-\frac{1}{150}\)

\(A=\frac{1}{3}-\frac{1}{150}\)

\(A=\frac{49}{150}\)

Answer 6

A= 1/3-1/7+....+1/140-1/150

A= 1/3-1/150

A= 49/150