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\(\frac{4}{5}\cdot\frac{3}{7}+\frac{4}{5}\cdot\frac{6}{7}-\frac{4}{5}\cdot\frac{4}{14}\)
\(=\frac{4}{5}\cdot\left(\frac{3}{7}+\frac{6}{7}-\frac{4}{14}\right)\)
\(=\frac{4}{5}\cdot1=\frac{4}{5}\)
#Louis
\(3\frac{1}{2}+4\frac{5}{7}-5\frac{5}{14}=\frac{7}{2}+\frac{33}{7}-\frac{75}{14}=\frac{49}{14}+\frac{66}{14}-\frac{75}{14}=\frac{40}{14}=\frac{20}{7}\)
#Fox
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840 phan 1400,800 phan 1400,350 phan 1400,280 phan 1400,700 phan 1400
\(\dfrac{x+3}{5}=\dfrac{7}{6}\Rightarrow6x+18=35\Leftrightarrow6x=17\Leftrightarrow x=\dfrac{17}{6}\)
đk : x khác 9
\(\dfrac{4}{9-x}=\dfrac{1}{3}\Rightarrow12=9-x\Leftrightarrow-x=3\Leftrightarrow x=-3\)
\(\dfrac{3}{5}+\dfrac{2}{7}=\dfrac{21}{35}+\dfrac{10}{35}=\dfrac{31}{35}\)
a)\(\dfrac{7}{19}\)
b)\(\dfrac{9}{10}\)
c)\(\dfrac{17}{23}\)
d)\(\dfrac{25}{58}\)
bai toan @gmail.com
5/3 < a < 5/7 : 1/3
1,66666.....< a < 17/7
1,66666.....< a < 2,42............
vậy a=2