Câu 25:
Nếu ∫25f(x)dx=2\displaystyle\int_2^5 f(x) \mathrm{d} x=2∫25f(x)dx=2 thì ∫253f(x)dx\displaystyle\int_2^5 3 f(x) \mathrm{d} x∫253f(x)dx bằng
