计算x²-(x-2)²

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计算x²-(x-2)²
计算x²-(x-2)²

计算x²-(x-2)²
x²-(x-2)²
=x²-(x²-4x+4)
=x²-x²+4x-4
=4x-4

x²-(x-2)²
=(x+X-2)(x-x+2)
=4(x-1)


x^2-(x-2)^2
=x^2-(x^2-4x+4)
=4x-4.

=x²-(x²-4x+4)
=x²-x²+4x-4
=4x-4

x^2-(x-2)^2
=x^2-(x^2-4x+4)
=x^2-x^2-4x+4
=-4x+4
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