Question

\(S=\frac{\frac{1}{4}+\frac{1}{6}+\frac{1}{10}}{\frac{5}{4}+\frac{5}{6}+\frac{5}{10}}\)

Tính S

 Chứng minh S<\(\frac{3}{10}\)

Answer 1

S = 1/5 = 2/10

Vì 2/10 < 3/10 => S < 3/10 (đpcm)

Ai k mk mk k lại cho !!

Answer 2

\(S=\frac{\frac{1}{4}+\frac{1}{6}+\frac{1}{10}}{5\cdot\left(\frac{1}{4}+\frac{1}{6}+\frac{1}{10}\right)}\)

\(S=\frac{1}{5}\)

\(\frac{1}{5}<\frac{3}{10}\)

\(S<\frac{3}{10}\)

Answer 3

S=\(\frac{\frac{1}{4}+\frac{1}{6}+\frac{1}{10}}{\frac{5}{4}+\frac{5}{6}+\frac{5}{10}}\)

=\(\frac{\frac{1}{4}+\frac{1}{6}+\frac{1}{10}}{5.\left(\frac{1}{4}+\frac{1}{6}+\frac{1}{10}\right)}\)

=\(\frac{1}{5}=\frac{2}{10}<\frac{3}{10}\)

Answer 4

mình k cho cậu rồi đấy k cho mình đi