Объяснение:
= 8(x - y) - b(x - y) = (8 - b)(x - y)
= 3m(m + 5n) - 2(m + 5n) = (3m - 2)(m + 5n)
8(х-у) -b(x-y) =(x-y) (8-b)
3mm+15mn-2m-10n=3mm+3×5mn-2m-2×5n=3m(5mn)-2(5mn) =(5mn) (3m-2)
