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4.分解因式.
(1)$4mx-6my+2m$.
(2)$(a-b)^{2}+b(b-a)$.
(3)$12a^{3}b^{4}c^{2}-18a^{2}b^{5}$.
(4)$15x(x-y)-12(y-x)^{2}$.
(1)$4mx-6my+2m$.
(2)$(a-b)^{2}+b(b-a)$.
(3)$12a^{3}b^{4}c^{2}-18a^{2}b^{5}$.
(4)$15x(x-y)-12(y-x)^{2}$.
答案：
4.
(1)$2m(2x - 3y + 1)$.
(2)$(a - b)(a - 2b)$.
(3)$6a^{2}b^{4}(2ac^{2}-3b)$.
(4)$3(x - y)(x + 4y)$.
(1)$2m(2x - 3y + 1)$.
(2)$(a - b)(a - 2b)$.
(3)$6a^{2}b^{4}(2ac^{2}-3b)$.
(4)$3(x - y)(x + 4y)$.
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