2011的平方-2009×2013

问题描述:

2011的平方-2009×2013

2011²-2009×2013
=(2011²-(2011+2)(2011-2)
=2011²-2011²+2²
=2²
4

2011的平方-2009×2013
=2011^2-(2011-2)(2011+2)
=2011^2-2011^2+4
=4

2011的平方-2009×2013
=2011²-(2011-2)(2011+2)
=2011²-2011²+4
=4

2011²-2009*2013
=2011²-(2011-2)(2011+2)
=4