分解因式，过程要详细
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(1)a²+ab-ac-bc=a（a+b)-c（a+b)=（a-c)（a+b)
(4) a³-ab²-a²-ab=a(a²-b²-a-b)=a[(a-b)(a+b)-(a+b)]=a(a-b-1)(a+b)
(2)2ax-10ay+5by-bx=2a(x-5y)-b（x-5y)=(2a-b)（x-5y)
(5)1-16m²+8mn-n²=1-(16m²-8mn+n²)=1-(4m-n)²=(1-4m+n)(1+4m-n)
(3)x²-y²-x+y=(x+y)(x-y)-(x-y)=(x+y)(x-y-1)
(6)4x²+y²-9-4xy=4x²-4xy+y²-9=(2x-y)²-9=(2x-y+3)(2x-y-3)
(4) a³-ab²-a²-ab=a(a²-b²-a-b)=a[(a-b)(a+b)-(a+b)]=a(a-b-1)(a+b)
(2)2ax-10ay+5by-bx=2a(x-5y)-b（x-5y)=(2a-b)（x-5y)
(5)1-16m²+8mn-n²=1-(16m²-8mn+n²)=1-(4m-n)²=(1-4m+n)(1+4m-n)
(3)x²-y²-x+y=(x+y)(x-y)-(x-y)=(x+y)(x-y-1)
(6)4x²+y²-9-4xy=4x²-4xy+y²-9=(2x-y)²-9=(2x-y+3)(2x-y-3)
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