\(1\frac{13}{15}.0,75-\left(\frac{11}{20}+\frac{25}{100}\right):\frac{3}{7}\)
= \(\frac{7}{5}-\frac{4}{5}:\frac{3}{7}\)
= \(\frac{7}{5}-\frac{28}{15}\)
= \(-\frac{7}{15}\)
\(1\frac{13}{15}\cdot0,75-\left(\frac{11}{20}+\frac{25}{100}\right):\frac{3}{7}\)
=>\(\frac{28}{15}\cdot\frac{3}{4}-\left(\frac{55}{100}+\frac{25}{100}\right)\cdot\frac{7}{3}\)
=>\(\frac{84}{60}-\frac{80}{100}\cdot\frac{7}{3}\)
=>\(\frac{7}{5}-\frac{4}{5}\cdot\frac{7}{3}=\frac{7}{5}-\frac{28}{15}\)
=>\(\frac{7}{5}-\frac{18}{14}=\frac{98}{60}-\frac{90}{60}=\frac{8}{60}=\frac{4}{30}\)
nhầm , từ cái đoạn \(\frac{7}{5}-\frac{28}{15}=\frac{21}{15}-\frac{18}{15}=\frac{-7}{15}\)
chúc bn học tốt
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