(0.3a^3 b^4)²(-0.2a^4 b^3)^3

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(0.3a^3b^4)²(-0.2a^4b^3)^3(0.3a^3b^4)²(-0.2a^4b^3)^3(0.3a^3b^4)²(-0.2a^4b^3)^3(0.3a^3

(0.3a^3 b^4)²(-0.2a^4 b^3)^3
(0.3a^3 b^4)²(-0.2a^4 b^3)^3

(0.3a^3 b^4)²(-0.2a^4 b^3)^3
(0.3a^3 b^4)²(-0.2a^4 b^3)^3
=0.09a^6b^8(-0.008a^12b^9)
=-0.00072a^18b^17

原式=0.09a^6b^8*(-0.008a^12b^9)
=-0.00072a^18b^17