用简便方法计算2013²-2012²,(x²+y²)²-4x²y²,当x=3.5,y=1.5
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用简便方法计算2013²-2012²,(x²+y²)²-4x²y²,当x=3.5,y=1.5
用简便方法计算2013²-2012²,(x²+y²)²-4x²y²,当x=3.5,y=1.5
用简便方法计算2013²-2012²,(x²+y²)²-4x²y²,当x=3.5,y=1.5
2013²-2012²
=(2013+2012)×(2013-2012)
=4025×1
=4025
(x²+y²)²-4x²y²
=(x²+y²+2xy)(x²+y²-2xy)
=(x+y)²(x-y)²
=(3.5+1.5)²×(3.5-1.5)²
=25×4
=100