因式分解、速~(y+3)*(y+5)*(y-4)*(y-6)+80=?
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因式分解、速~(y+3)*(y+5)*(y-4)*(y-6)+80=?
因式分解、速~
(y+3)*(y+5)*(y-4)*(y-6)+80=?
因式分解、速~(y+3)*(y+5)*(y-4)*(y-6)+80=?
原式=(y+3)(y-4)(y+5)(y-6)+80
=(y^2-y-12)(y^2-y-30)+80
设y^2-y=a;
则有(a-12)(a-30)+80
=a^2-42a+360+80
=a^2-42a+440
=(a-20)(a-22)
=(y^2-y-20)(y^2-y-22)
=(y-5)(y+4)(y^2-y-22)
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