-2【a²bc】²×二分之一a×【bc】³-【-abc】³×【-abc】²

-2【a²bc】²×二分之一a×【bc】³-【-abc】³×【-abc】²
-2【a²bc】²×二分之一a×【bc】³-【-abc】³×【-abc】²

-2【a²bc】²×二分之一a×【bc】³-【-abc】³×【-abc】²
-2(a^2bc)^2×1/2a×(bc)^3 - (-abc)^3×(-abc)^2
= -2a^4b^2c^2×1/2a×b^3c^3 - (-a^3b^3c^3)×a^b^c^2
= -a^5b^5c^5 +a^5b^5c^5
= 0

-2【a²bc】²×二分之一a×【bc】³-【-abc】³×【-abc】²
= -2a^4b^2c^2×1/2a×b^3c^3 +a^3b^3c^3×a^2b^2c^2
= -a^5b^5c^5 +a^5b^5c^5
= 0