2d - 8 d-4 107. Упростите выражение: b 4b - 1 b-5 4b-20 2) 3) 2 m 16 m2 + 8m a-2 2a-6 a-1 за - 9 ; 4) 5) 6) x² - 2xy a² + b2 2a2 + 2ab b + 4 ab-b2 с-4 4c + 24 27 + ху - 2у² Ь a+b + а + 4 a2 - ab 4c + 9 c2 + 6c

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