thực hien phep tính sau
1\(\frac{13}{15}\). 0,75 - (\(\frac{8}{15\:\:}\)+ 25% )
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\(A=\left(\frac{3}{8}+\frac{-3}{4}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(A=\left(\frac{3}{8}+\frac{-6}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(A=\left(\frac{-3}{8}+\frac{7}{12}\right):\frac{5}{6}+\frac{1}{2}\)
\(A=\left(\frac{-36}{24}+\frac{56}{24}\right):\frac{5}{6}+\frac{1}{2}\)
\(A=\frac{5}{6}:\frac{5}{6}+\frac{1}{2}\)
\(A=\frac{5}{6}\times\frac{6}{5}+\frac{1}{2}\)
\(A=1+\frac{1}{2}\)
\(A=\frac{1}{1}+\frac{1}{2}=\frac{2}{2}+\frac{1}{2}\)
\(A=\frac{3}{2}\)
\(1\frac{13}{15}.0,75-\left(\frac{8}{15}+25\%\right)\)
\(=\frac{28}{15}.\frac{75}{100}-\left(\frac{8}{15}+\frac{25}{100}\right)\)
\(=\frac{7}{5}-\frac{47}{60}\)
\(=\frac{37}{60}\)
\(1\frac{13}{15}.0,75-\left(\frac{8}{15}+25\%\right)=\frac{28}{15}.\frac{3}{4}-\left(\frac{8}{15}+\frac{1}{4}\right)=\frac{7}{5}-\frac{8}{15}-\frac{1}{4}=\frac{37}{60}\)