\(\frac{\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right).\frac{12}{49}}{3\frac{1}{3}+\frac{2}{9}}=\frac{\left(\frac{3}{20}+\frac{1}{2}-\frac{1}{5}\right).\frac{12}{49}}{\frac{10}{3}+\frac{2}{9}}=\frac{\left(\frac{13}{20}-\frac{1}{5}\right).\frac{12}{49}}{\frac{32}{9}}=\frac{\frac{9}{20}.\frac{12}{49}}{\frac{32}{9}}=\frac{\frac{27}{245}}{\frac{32}{9}}=\frac{243}{7840}\)
Có đúng không vu bao quynh?