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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
Thực hiện phép tính
a ) \(\frac{2}{5}+\frac{-1}{6}-\frac{3}{4}-\frac{-2}{3}\)
= \(\frac{2}{5}+\frac{-1}{6}+\frac{-3}{4}+\frac{2}{3}\)
= \(\left(\frac{2}{5}+\frac{-3}{4}\right)+\left(\frac{-1}{6}+\frac{2}{3}\right)\)
= \(\left(\frac{8}{20}+\frac{-15}{20}\right)+\left(\frac{-1}{6}+\frac{4}{6}\right)\)
= \(\left(\frac{8+\left(-15\right)}{20}\right)+\left(\frac{\left(-1\right)+4}{6}\right)\)
= \(\frac{-7}{20}+\frac{1}{2}\)
= \(\frac{-7}{20}+\frac{10}{20}=\frac{\left(7\right)+10}{20}=\frac{3}{20}\)
tk mk nha
đang âm rất nhiều rồi , giúp nha !!!!!
a) \(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{25}\)
\(=\frac{2}{3}-\frac{2}{5}=\frac{4}{15}\)
b) \(\frac{-2}{5}\cdot\frac{5}{8}+\frac{5}{8}\cdot\frac{3}{5}\)
\(=\frac{5}{8}\left(-\frac{2}{5}+\frac{3}{5}\right)\)
\(=\frac{5}{8}\cdot\frac{1}{5}=\frac{1}{8}\)
c) \(25\%-1\frac{1}{2}+0,5\cdot\frac{12}{5}\)
\(=0,25-1,5+0,5\cdot2,4\)
\(=0,25-1,5+1,2=-0,05\)
a) \(\frac{2}{3}-\frac{5}{7}\cdot\frac{14}{25}=\frac{2}{3}-\frac{2}{5}=\frac{10-6}{15}=\frac{4}{15}\)
b) \(-\frac{2}{5}\cdot\frac{5}{8}+\frac{5}{8}\cdot\frac{3}{5}=\frac{5}{8}\cdot\left(-\frac{2}{5}+\frac{3}{5}\right)=\frac{5}{8}\cdot\frac{1}{5}=\frac{1}{8}\)
c) \(25\%-1\frac{1}{2}+0,5\cdot\frac{12}{5}=\frac{1}{4}-\frac{3}{2}+\frac{1}{2}\cdot\frac{12}{5}=\frac{1}{4}-\frac{3}{2}+\frac{6}{5}=\frac{5-30+24}{20}=-\frac{1}{20}\)
~~ Chúc bạn học tốt ~~
\(14:\left(4\frac{1}{2}-2\frac{5}{8}\right)+14.\frac{1}{4}.\frac{2}{3}\)
\(=14:\frac{15}{8}+14.\frac{1}{6}\)
\(=14.\frac{8}{15}+14.\frac{1}{6}\)
\(=14.\left(\frac{8}{15}+\frac{1}{6}\right)\)
\(=14.\frac{7}{10}\)
\(=\frac{98}{10}\)
đúng thì ủng hộ nha
\(14\div\left(4\frac{1}{2}-2\frac{5}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}=14\div\left(\frac{9}{2}-\frac{21}{8}\right)+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=14\div\frac{15}{8}+14\times\frac{1}{4}\times\frac{2}{3}\)
\(=\frac{112}{15}+\frac{7}{3}\)
\(=\frac{49}{5}\)
CHÚC BẠN HỌC TỐT