Представте выражение в виде многочлена:
2/3ab(0.3a^2-1.2(ab-5/6))a^3
=(1/5a^3b-4/5ab(ab-5/6)a^3=(1/5a^3b-4/5a^2b^2+2/3ab)a^3=1/5a^6b-4/5a^5b^2+2/3a^4b
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=(1/5a^3b-4/5ab(ab-5/6)a^3=(1/5a^3b-4/5a^2b^2+2/3ab)a^3=1/5a^6b-4/5a^5b^2+2/3a^4b