因式分解 :(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10a^2 n-12abm (4)a(b-c)+a^2-bc(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2
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![因式分解 :(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10a^2 n-12abm (4)a(b-c)+a^2-bc(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2](/uploads/image/z/4339971-27-1.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3+%EF%BC%9A%281%29.x%5E2-4y%5E2-x%2B2y+%282%29.x%5E2-2x-b%5E2-2b+%283%29.5a%5E2+m%2B6abm-10a%5E2+n-12abm+%284%29a%28b-c%29%2Ba%5E2-bc%285%29.x%5E2-y%5E2%2B2y-1+%EF%BC%886%EF%BC%89x%5E2%2B4y-1-4y%5E2)
因式分解 :(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10a^2 n-12abm (4)a(b-c)+a^2-bc(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2
因式分解 :(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10a^2 n-12abm (4)a(b-c)+a^2-bc
(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2
因式分解 :(1).x^2-4y^2-x+2y (2).x^2-2x-b^2-2b (3).5a^2 m+6abm-10a^2 n-12abm (4)a(b-c)+a^2-bc(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2
:(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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