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
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
(5).x^2-y^2+2y-1 (6)x^2+4y-1-4y^2
数学人气:429 ℃时间:2020-03-21 17:55:14
优质解答
:(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+6...
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