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\(\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}:7+\frac{6}{5}\)
\(=\frac{3}{5}\times\frac{6}{7}+\frac{3}{5}\times\frac{1}{7}+\frac{6}{5}\)
\(=\frac{3}{5}\times\left(\frac{6}{7}+\frac{1}{7}\right)+\frac{6}{5}\)
\(=\frac{3}{5}\times1+\frac{6}{5}\)
\(=\frac{3}{5}+\frac{6}{5}=\frac{9}{5}\)
~ Hok tốt ~
\(\frac{29}{12}:\frac{1}{2}-\frac{5}{12}:\frac{1}{2}-\frac{1}{2}\)
\(=\left(\frac{29}{12}-\frac{5}{12}\right):\frac{1}{2}-\frac{1}{2}\)
\(=2:\frac{1}{2}-\frac{1}{2}\)
\(=4-\frac{1}{2}=\frac{7}{2}\)
~ Hok tốt ~
\(\dfrac{5}{7}\times\dfrac{14}{15}=\dfrac{2}{3}\)
\(\dfrac{4}{9}\times\dfrac{15}{2}=\dfrac{10}{3}\)
\(\left(2+\frac{2}{3}-\frac{1}{4}\right)\cdot\frac{1}{5}\)
\(=\left(\frac{24}{12}+\frac{8}{12}-\frac{3}{12}\right)\cdot\frac{1}{5}\)
\(=\frac{29}{12}\cdot\frac{1}{5}\)
\(=\frac{29}{60}\)
\(\frac{7}{15}\cdot\frac{15}{14}=\frac{1}{1}\cdot\frac{1}{2}=\frac{1}{2}\)
a) \(\left(2+\frac{2}{3}-\frac{1}{4}\right)\cdot\frac{1}{5}=\left(\frac{8}{3}-\frac{1}{4}\right)\cdot\frac{1}{5}=\frac{29}{12}\cdot\frac{1}{5}=\frac{29}{60}\)
b)\(\frac{7}{15}\cdot\frac{15}{14}=\frac{105}{210}=\frac{1}{2}\)
4/5 x 15/11 x 2/9 = 8/33
4/7 x 2/5 + 4/7 x 3/5 = 4/7
( 5/7 + 7/8 ) x 2 = 89/28
2/14 + 3/7 - 3/14 x 2 = 1/7
tk mình nhé, mk nhanh nhất
\(\dfrac{3}{5}.\dfrac{5}{7}+\dfrac{12}{20}.\dfrac{2}{14}+\dfrac{9}{15}.\dfrac{1}{7}\)
\(=\dfrac{3}{7}+\dfrac{3}{35}+\dfrac{3}{35}\)
\(=\dfrac{3}{7}+\dfrac{6}{35}\)
\(=\dfrac{15}{35}+\dfrac{6}{35}\)
\(=\dfrac{21}{35}\)
\(=\dfrac{3}{5}\)
\(\dfrac{2}{7}+\dfrac{15}{14}=\dfrac{4}{14}+\dfrac{15}{14}=\dfrac{19}{14}\)
= 19/14