(1)4x^2-4x+1 (2)-9x^2+12xy-4y^2

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(1)4x^2-4x+1 (2)-9x^2+12xy-4y^2
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(1)4x^2-4x+1 (2)-9x^2+12xy-4y^2
(1)4x^2-4x+1 (2)-9x^2+12xy-4y^2

(1)4x^2-4x+1 (2)-9x^2+12xy-4y^2
4x²-2x-2x+1
=2x(2x-1)-(2x-1)
=(2x-1)²
-9x^2+12xy-4y^2
=-(9x^2-12xy+4y^2)
=-(3x-2y)^2

教你一个方法,十字交叉法: a c
abx^2+(ad+bc)x+cd= * = (ax+c)*(bx+d) ,不懂得话可以再问
b d

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