16 - у² = 4² - у² = (4 - y)(4 + y)
45q² + 30pq + 5p² = 5(9q² + 6pq + p²) = 5( (3q)² + 2*3q*p + p² ) =
= 5(3q + p)² = 5(3q+p)(3q+p)
¹/₈ km³ + kn³ = k(0.125m³ + n³) = k( (0.5m)³ + n³ ) =
= k(0.5m + n)( (0.5m)² - 0.5mn + n²) =
= k(0.5m+n)(0.25m² - 0.5mn + n)
ax³ - ay³ = a(x³ - y³) = a(x-y)(x² +xy + y²)
(a³b - ab³) / (a² + ab - 3a - 3b) =
= ( ab(a² - b²) ) / ( a(a+b) - 3(a+b) ) =
= (ab(a-b)(a+b) ) / ( (a-3)(a+b) ) =
= ( ab(a-b) ) / (a - 3)