分解因式
把下列各因式分解(1)a³-3a²+2a(2)4m²-9m²-4m+1(3)3a²+bc-3ac-ab(4)9-x...
把下列各因式分解 (1)a³-3a²+2a (2)4m²-9m²-4m+1 (3)3a²+bc-3ac-ab (4)9-x²+2xy-y²
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解
a³-3a²+2a
=a(a²-3a+2)
=a(a-2)(a+1)
4m²-9m²-4m+1
=4m²-4m+1-(3m)²
=(2m-1)²-(3m)²
=(2m-1+3m)(2m-1-3m)
=(5m-1)(-m-1)
=-(5m-1)(m+1)
3a²+bc-3ac-ab
=(3a²-3ac)+(bc-ab)
=3a(a-c)+b(c-a)
=3a(a-c)-b(a-c)
=(3a-b)(a-c)
9-x²+2xy-y²
=3²-(x²-2xy+y²)
=3²-(x-y)²
=(3-x+y)(3+x-y)
a³-3a²+2a
=a(a²-3a+2)
=a(a-2)(a+1)
4m²-9m²-4m+1
=4m²-4m+1-(3m)²
=(2m-1)²-(3m)²
=(2m-1+3m)(2m-1-3m)
=(5m-1)(-m-1)
=-(5m-1)(m+1)
3a²+bc-3ac-ab
=(3a²-3ac)+(bc-ab)
=3a(a-c)+b(c-a)
=3a(a-c)-b(a-c)
=(3a-b)(a-c)
9-x²+2xy-y²
=3²-(x²-2xy+y²)
=3²-(x-y)²
=(3-x+y)(3+x-y)
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