(1).x^2-xy+x (2).m^2n-mn^2+mn (3).9x^3y^3-21x^3y^2+12x^2y^2 (4).x^2(x-y)+y^2(x-y)多项式因式分解

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(1).x^2-xy+x (2).m^2n-mn^2+mn (3).9x^3y^3-21x^3y^2+12x^2y^2 (4).x^2(x-y)+y^2(x-y)多项式因式分解
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(1).x^2-xy+x (2).m^2n-mn^2+mn (3).9x^3y^3-21x^3y^2+12x^2y^2 (4).x^2(x-y)+y^2(x-y)多项式因式分解
(1).x^2-xy+x (2).m^2n-mn^2+mn (3).9x^3y^3-21x^3y^2+12x^2y^2 (4).x^2(x-y)+y^2(x-y)多项式因式分解

(1).x^2-xy+x (2).m^2n-mn^2+mn (3).9x^3y^3-21x^3y^2+12x^2y^2 (4).x^2(x-y)+y^2(x-y)多项式因式分解
(1).x^2-xy+x
=x(x-y+1)
(2).m^2n-mn^2+mn
=mn(m-n+1)
(3).9x^3y^3-21x^3y^2+12x^2y^2
=3x²y²(3xy-7x+4y)
(4).x^2(x-y)+y^2(x-y)
=(x-y)(x²+y²)
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