因式分解 ：(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10
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：(1).x^2-4y^2-x+2y

=(x+2y)(x-2y)-(x-2y)

=(x-2y)(x+2y-1)

(2).x^2-2x-b^2-2b

=x²-b²-2x-2b

=(x+b)(x-b)-2(x+b)

=(x+b)(x-b-2)

(3).5a^2 m+6abm-10a^2 n-12abn 最后一个m改成了n

=am(5a+6b)-2an(5a+6b)

=a(5a+6b)(m-2n)

(4)a(b-c)+a^2-bc

=ab+a²-ac-bc

=a(a+b)-c(a+b)

=(a+b)(a-c)

(5).x^2-y^2+2y-1

=x²-(y-1)²

=(x+y-1)(x-y+1)

（6）x^2+4y-1-4y^2

=x²-(2y-1)²

=(x+2y-1)(x-2y+1)

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