\(\frac{2}{3}+\frac{2}{7}-\frac{1}{14}-1-\frac{3}{7}+\frac{3}{28}\)
\(=\frac{2}{3}+\left(\frac{2}{7}-\frac{1}{14}-\frac{1}{1}-\frac{3}{7}+\frac{3}{28}\right)\)
\(=\frac{2}{3}+\left(\frac{8}{28}-\frac{2}{28}-\frac{28}{28}-\frac{12}{28}+\frac{3}{28}\right)\)
\(=\frac{2}{3}+\left(\frac{8-2-28-12+3}{28}\right)\)
\(=\frac{2}{3}+\frac{-31}{28}\)
\(=\frac{2}{3}-\frac{31}{28}\)
\(=\frac{56}{84}-\frac{93}{84}\)
\(=\frac{56-93}{84}\)
\(=\frac{-37}{84}\)
\(=-\frac{37}{84}\)
OK , MÌNH GHI RÕ TỪNG CHI TIẾT RỒI NHA , CHÚC BẠN HỌC TỐT !!!