(-x-y)·(x-y),(x-2)(x²+4)(x+2),(a+2b)(a-2b)-(a+2b)²2012²用平方差公式,a²+b²,ab
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(-x-y)·(x-y),(x-2)(x²+4)(x+2),(a+2b)(a-2b)-(a+2b)²2012²用平方差公式,a²+b²,ab(-x-y
(-x-y)·(x-y),(x-2)(x²+4)(x+2),(a+2b)(a-2b)-(a+2b)²2012²用平方差公式,a²+b²,ab
(-x-y)·(x-y),(x-2)(x²+4)(x+2),(a+2b)(a-2b)-(a+2b)²
2012²用平方差公式,a²+b²,ab
(-x-y)·(x-y),(x-2)(x²+4)(x+2),(a+2b)(a-2b)-(a+2b)²2012²用平方差公式,a²+b²,ab
(-x-y)·(x-y)=Y^2-X^2,
(x-2)(x²+4)(x+2)=(X^2-4)(X^2+4)=X^4-16
(a+2b)(a-2b)-(a+2b)²
=a^2-4b^2-(a^2+4ab+4b^2)
=-4ab
2012^2=(2000+12)^2=4000000+48000+144=448144.
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