(a^2-1)(a^2+8a+15)-20 因式分解
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(a^2-1)(a^2+8a+15)-20 因式分解
(a^2-1)(a^2+8a+15)-20 因式分解
(a^2-1)(a^2+8a+15)-20 因式分解
=(a+1)(a-1)(a+3)(a+5)-20
=[(a-1)(a+5)][(a+1)(a+3)]-20
=[(a^2+4a)-5][(a^2+4a)+3]-20
=(a^2+4a)^2-2(a^2+4a)-15-20
=(a^2+4a)^2-2(a^2+4a)-35
=(a^2+4a-7)(a^2+4a+5)