Вправи: 270

270. Спростіть вираз:

1) 12a2 ∙ 5a3b7 = 60a5b7;3) 3ab ∙ (–17a2b) = –51a3b2;

2) –4m3 ∙ 0,25m6 = –m9;4) 56x5y14 ∙ 27x2y = 16x7y15;

5) –13p² ∙ (–27k) ∙ 5pk = 45p³k²;

6) 214b²c⁵d³ ∙ (–313b³c⁴d⁷) = –94b²c⁵d³ ∙ 103b³c⁴d⁷ = –7,5b⁵c⁹d¹⁰.