1.(3x²-2y)(-3x²-2y)=___ 2.2009²-2008*2010(简便)
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1.(3x²-2y)(-3x²-2y)=___2.2009²-2008*2010(简便)1.(3x²-2y)(-3x²-2y)=___2.2009
1.(3x²-2y)(-3x²-2y)=___ 2.2009²-2008*2010(简便)
1.(3x²-2y)(-3x²-2y)=___ 2.2009²-2008*2010(简便)
1.(3x²-2y)(-3x²-2y)=___ 2.2009²-2008*2010(简便)
1、(3x²-2y)(-3x²-2y)
=-(3x²-2y)(3x²+2y)
=-(9x²-4y²)
=4y²-9x⁴
2、2009²-2008*2010(简便)
=2009²-(2009-1)*(2009+1)
=2009²-(2009²-1)
=2009²-2009²+1
=1
(3x²-2y)(-3x²-2y)
=4y²-9x的四次方
2009²-2008*2010
=2009²-(2009-1)(2009+1)
=2009²-2009²+1
=1