chắc thế này :
\(A=1\frac{13}{15}\cdot\frac{1}{4}\cdot\left|-3\right|-\left(\frac{8}{15}-25\%\right)\div\frac{17}{40}\)
\(A=\frac{28}{15}\cdot\frac{1}{4}\cdot3-\left(\frac{8}{15}-\frac{25}{100}\right)\div\frac{17}{40}\)
\(A=\frac{7}{15}\cdot3-\left(\frac{8}{15}-\frac{1}{4}\right)\div\frac{17}{40}\)
\(A=\frac{21}{15}-\frac{17}{60}\div\frac{17}{40}\)
\(A=\frac{21}{15}-\frac{17}{60}\cdot\frac{40}{17}\)
\(A=\frac{21}{15}-\frac{40}{60}\)
\(A=\frac{21}{15}-\frac{2}{3}\)
\(A=\frac{11}{15}\)
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