(-3a²b)³-8(a²)²·(-b)²·(-a²b)
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(-3a²b)³-8(a²)²·(-b)²·(-a²b)
(-3a²b)³-8(a²)²·(-b)²·(-a²b)
(-3a²b)³-8(a²)²·(-b)²·(-a²b)
=-27 a^6 b^3 - 8 a^4 b^2 (-a^2 b)
=-27 a^6 b^3 + 8 a^6 b^3
=-19 a^6 b^3