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(a+1)(a+3)(a+5)(a+7)+15
=(a+1)(a+7)(a+3)(a+5)+15
=(a�0�5+8a+7)(a�0�5+8a+15)+15
设a�0�5+8a+11=A
(a+1)(a+3)(a+5)(a+7)+15
=(A-4)(A+4)+15
=A�0�5-16+15
=A�0�5-1
=(A+1)(A-1)
=(a�0�5+8a+12)(a�0�5+8a+10)
=(a+2)(a+6)(a�0�5+8a+10) 我做过，绝对正确
=(a+1)(a+7)(a+3)(a+5)+15
=(a�0�5+8a+7)(a�0�5+8a+15)+15
设a�0�5+8a+11=A
(a+1)(a+3)(a+5)(a+7)+15
=(A-4)(A+4)+15
=A�0�5-16+15
=A�0�5-1
=(A+1)(A-1)
=(a�0�5+8a+12)(a�0�5+8a+10)
=(a+2)(a+6)(a�0�5+8a+10) 我做过，绝对正确
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