Question

25а÷b³: (25аb)
помогите

Answer 1

$\frac{25a}{b {}^{3} } : (25ab) \\ \\ \frac{25a}{b {}^{3} } \times \frac{1}{25ab} \\ \\ \frac{1}{b {}^{3} } \times \frac{1}{b} \\ \\ \frac{1}{b {}^{4} }$