[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5) 化简

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[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5)化简[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5)化简[(2a-1)(

[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5) 化简
[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5) 化简

[(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5) 化简
(2a-1)(2a+1)+(a+2)(a-2)-4a²(a²+5)
=(4a²-1)+(a²-4)-4a^4-20a²
=-4a^4-15a²-5
=-(4a^4+15a²+5)