因式分解从(4)开始全部谢谢
1个回答
2018-05-13
展开全部
(4)(a²-a-6)(a²+3a-4)+24
=(a-3)(a+2)(a-1)(a+4)+24
=[(a-3)(a+4)][(a-1)(a+2)]+24
=(a²+a-12)(a²+a-2)+24
=(a²+a)²-14(a²+a)+24
=(a²+a-2)(a²+a+10)
=(a+2)(a-1)(a²+a+10)
————
(6)x²-y²-2x-4y-3
=(x²-2x+1)-(y²+4y+4)
=(x-1)²-(y+2)²
=(x-1+y+2)(x-1-y-2)
=(x+y+1)(x-y-3)
=(a-3)(a+2)(a-1)(a+4)+24
=[(a-3)(a+4)][(a-1)(a+2)]+24
=(a²+a-12)(a²+a-2)+24
=(a²+a)²-14(a²+a)+24
=(a²+a-2)(a²+a+10)
=(a+2)(a-1)(a²+a+10)
————
(6)x²-y²-2x-4y-3
=(x²-2x+1)-(y²+4y+4)
=(x-1)²-(y+2)²
=(x-1+y+2)(x-1-y-2)
=(x+y+1)(x-y-3)
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