分解因式(1)1/9m^2+2/3mn+n^2 (2)25a^2-20ab+4b^2 (3)-x^2-81y^2-18xy (4)(x+y)^2-6(x+y)+9分解因式:(1)3a^3+12a^2+12ab^2(2)-6m^3n^3-3m^2n^2+12m^2n^3(3)2a^2b^2-28ab+98(4)6a^2-a^3-9a(5)a^4-2a^2+1(6)
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分解因式(1)1/9m^2+2/3mn+n^2 (2)25a^2-20ab+4b^2 (3)-x^2-81y^2-18xy (4)(x+y)^2-6(x+y)+9分解因式:(1)3a^3+12a^2+12ab^2(2)-6m^3n^3-3m^2n^2+12m^2n^3(3)2a^2b^2-28ab+98(4)6a^2-a^3-9a(5)a^4-2a^2+1(6)
分解因式(1)1/9m^2+2/3mn+n^2 (2)25a^2-20ab+4b^2 (3)-x^2-81y^2-18xy (4)(x+y)^2-6(x+y)+9
分解因式:
(1)3a^3+12a^2+12ab^2
(2)-6m^3n^3-3m^2n^2+12m^2n^3
(3)2a^2b^2-28ab+98
(4)6a^2-a^3-9a
(5)a^4-2a^2+1
(6)(x^2+y^2)^2-4x^2y^2
第(2)个改正:-6m^3n^2-3m^2n^2+12m^2n^3
分解因式(1)1/9m^2+2/3mn+n^2 (2)25a^2-20ab+4b^2 (3)-x^2-81y^2-18xy (4)(x+y)^2-6(x+y)+9分解因式:(1)3a^3+12a^2+12ab^2(2)-6m^3n^3-3m^2n^2+12m^2n^3(3)2a^2b^2-28ab+98(4)6a^2-a^3-9a(5)a^4-2a^2+1(6)
(1)1/9m^2+2/3mn+n^2
=(1/3m+n)^2
(2)25a^2-20ab+4b^2
=(5a-2b)^2
(3)-x^2-81y^2-18xy
=-(x+9y)^2
(4)(x+y)^2-6(x+y)+9
=(x+y-3)^2
其实这些题都不太难,其他的你自己做吧,