第1个回答 2013-05-04
12a²b²-27
=3(4a^2b^2-9)
=3((2ab)^2-3^2)
=3(2ab-3)(2ab+3)
三分之一m^4 x^2-三分之四
=(1/3)(m^4x^2-4)
=(1/3)((m^2x)^2-2^2)
=(1/3)(m^2x-2)(m^2x+2)
(x²+2y²)(a-b)-(y²+2x²)(a-b)
=(a-b)(x^2+2y^2-(y^2+2x^2))
=(a-b)(x^2+2y^2-y^2-2x^2)
=(a-b)(y^2-x^2)
=(a-b)(y+x)(y-x)
25x^4-(y²+x²)²
=(5x^2-(y^2+x^2))(5x^2+(y^2+x^2))
=(5x^2-y^2-x^2)(5x^2+y^2+x^2)
=(4x^2-y^2)(6x^2+y^2)
=(2x+y)(2x-y)(6x^2+y^2)
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