Question

A=2/10×12+2/12×14+2/14×16+...+2/98×100 Giúp mình vs aa, mình gấp lắmmm-(

Answer 1

\(A=\dfrac{2}{20.12}+\dfrac{2}{12.14}+\dfrac{2}{14.16}+...+\dfrac{2}{98.100}\)

\(A=\dfrac{1}{10}-\dfrac{1}{12}+\dfrac{1}{12}-\dfrac{1}{14}+\dfrac{1}{14}-\dfrac{1}{16}+...+\dfrac{1}{98}-\dfrac{1}{100}\)

\(A=\dfrac{1}{10}-\dfrac{1}{100}\)

\(A=\dfrac{9}{100}\)

Answer 2

A=1/10−1/12+1/12−1/14+1/14−1/16+...+1/98−1/100

A=9/CHO TUI XIN 1 LIKE NHA