Câu hỏi 13nào sau đây bằng $$ \frac{9}{7 \times 53}? $$$\dfrac{0.9}{0.7 \times 53}$$\dfrac{0.9}{0.7 \times 0.53}$$\dfrac{0.9}{0.7 \times 5.3}$$\dfrac{0.9}{7 \times 0.53}$$\dfrac{0.09}{0.07 \times 0.53}$