(因式分解) 1-4(a+b)² (a²+9)²-4a四次方
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(因式分解) 1-4(a+b)² (a²+9)²-4a四次方
(因式分解) 1-4(a+b)² (a²+9)²-4a四次方
(因式分解) 1-4(a+b)² (a²+9)²-4a四次方
1-4(a+b)²
=(1+2a+2b)(1-2a-2b)
(a²+9)²-4a^4
=(a²+9+2a²)(a²+9-2a²)
=(3a²+9)(9-a²)
=3(a²+3)(3+a)(3-a)