Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a)\(\frac{2}{3}+\frac{3}{4}+\frac{5}{6}\)
\(=\frac{8+9+10}{12}\)
\(=\frac{27}{12}=\frac{9}{4}\)
b)\(\frac{15}{8}-\frac{7}{12}+\frac{5}{6}\)
\(=\frac{45-14+20}{24}\)
\(=\frac{51}{24}=\frac{17}{8}\)
2)
a)\(\frac{2}{5}+\frac{7}{13}+\frac{3}{5}+\frac{1}{7}\)
\(=\frac{2}{5}+\frac{3}{5}+\frac{7}{13}+\frac{1}{7}\)
\(=1+\frac{7}{13}+\frac{1}{7}\)
\(=\frac{20}{13}+\frac{1}{7}\)
\(=\frac{153}{91}\)
Tí tớ trả lời tiếp
a, 1,5+1-0,75/2,5+5\3-1,25
=15\10+1-75\100/25\10+5\3-125\100
=7\4/35/12
\(=\frac{3}{200}:\frac{3}{5}+\frac{3}{2}\left(\frac{4}{25}-\frac{2}{5}\right)-\frac{1}{25}.\left(\frac{7}{4}:\frac{7}{5}-\frac{5}{2}\right)\)
\(=\frac{3.5}{200.3}+\frac{3}{2}\left(\frac{4}{25}-\frac{2.5}{25}\right)-\frac{1}{25}\left(\frac{7.5}{4.7}-\frac{5}{2}\right)\)
\(=\frac{1}{40}+\frac{3}{2}\left(\frac{-6}{25}\right)-\frac{1}{25}\left(\frac{5}{4}-\frac{10}{4}\right)\)
\(=\frac{1}{40}-\frac{9}{25}+\frac{1}{20}\)
\(=\frac{1.5}{40.5}-\frac{9.8}{25.8}+\frac{1.10}{20.10}\)
\(=\frac{5-72+10}{200}=\frac{-57}{200}\)
\(2,5-\frac{2}{3}.\frac{3}{4}+3\frac{1}{6}\)
\(=\frac{5}{2}-\frac{2}{3}.\frac{3}{4}+\frac{19}{6}\)
\(=\frac{3}{4}.\frac{10}{3}-\frac{2}{3}.\frac{3}{4}-\frac{3}{4}.\frac{38}{9}\)
\(=\frac{3}{4}.\left(\frac{10}{3}-\frac{2}{3}-\frac{38}{9}\right)\)
\(=\frac{3}{4}.\left(\frac{30}{9}-\frac{6}{9}-\frac{38}{9}\right)\)
\(=\frac{3}{4}.\frac{-14}{9}\)
\(=-\frac{7}{6}\)
\(2,5-\frac{2}{3}\times\frac{3}{4}+3\frac{1}{6}\)
\(=\frac{5}{2}-\frac{1}{2}+3+\frac{1}{6}\)
\(=2+3+\frac{1}{6}\)
\(=5\frac{1}{6}\)
Chúc bn học tốt !!!