Ответ: (5b+15)/b.
Объяснение:
5b/(b-3) - (b+6)/(2b-6) * 90/(b^2+6b) = 5b/(b-3) - (b+6)/2(b-3) * 90/b(b+6)=
=(5b^2-45)/b(b-3)=5(b^2-9)/b(b-3)=5(b+3)(b-3) /b(b-3) = 5(b+3)/b=(5b+15)/b.
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Ответ: (5b+15)/b.
Объяснение:
5b/(b-3) - (b+6)/(2b-6) * 90/(b^2+6b) = 5b/(b-3) - (b+6)/2(b-3) * 90/b(b+6)=
=(5b^2-45)/b(b-3)=5(b^2-9)/b(b-3)=5(b+3)(b-3) /b(b-3) = 5(b+3)/b=(5b+15)/b.