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a)1,2:3,24=10/27
b)2\(\frac{1}{5}:\frac{3}{4}=\frac{11}{5}\cdot\frac{4}{3}=\frac{44}{15}\)
c)2/7:0,42=100/147
a) \(\frac{1}{3}-\left(\frac{1}{2}+\frac{1}{8}\right)\)
= \(\frac{1}{3}-\left(\frac{4}{8}+\frac{1}{8}\right)\)
= \(\frac{1}{3}-\frac{5}{8}\)
= \(\frac{8}{24}-\frac{15}{24}\)
= \(\frac{-7}{24}\)
b) \(\frac{1}{2}-\frac{1}{4}+\frac{1}{13}+\frac{1}{8}\)
= \(\left(\frac{1}{2}-\frac{1}{4}+\frac{1}{8}\right)\)+ \(\frac{1}{13}\)
= \(\left(\frac{4}{8}-\frac{2}{8}+\frac{1}{8}\right)+\frac{1}{13}\)
= \(\frac{1}{8}+\frac{1}{13}\)
= \(\frac{13}{104}+\frac{8}{104}\)
= \(\frac{23}{104}\)
c) \(13\frac{2}{7}:\left(\frac{-8}{9}\right)+2\frac{5}{7}:\left(\frac{-8}{9}\right)\)
= \(\left(13\frac{2}{7}+2\frac{5}{7}\right):\left(\frac{-8}{9}\right)\)
= \(16:\left(\frac{-8}{9}\right)\)
= -18
cau dau tien la sao
1,2 : 3,24 = \(\frac{12}{10}\): \(\frac{324}{100}\)= \(\frac{12}{10}\)x \(\frac{100}{324}\)= \(\frac{10}{27}\)
\(\frac{2}{7}\) : 0,42 = \(\frac{2}{7}\): \(\frac{42}{100}\)= \(\frac{2}{7}\)x \(\frac{100}{42}\)= \(\frac{100}{147}\)
Cau tren ko hieu ban viet nhu the nao nen mk ko lam duoc , kick mk nhe