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x2011

20122012x2011-20112011x2012 =2012×10001x2011-2011×10001x2012 =0

2013x2011/2012 =(2012+1)(2012-1)/2012 =2012^2-1/2012 =2012-1/2012 =2011又2011/2012

原式=2011×20122012-(2011+1)×20112011 =2011×20122012-2011×20112011-20112011 =2011×(20122012-20112011)-20112011 =2011×10001-20112011 =20112011-20112011 =0

20112011x2012-2011x20122012 =10001×2011×2012-2011×10001×2012 =0

20112011x2012-20122012x2011 =20112011x2011+20112011-20122012x2011 =20112011-(20122012-20112011)x2011 =20112011-10001x2011 =20112011-20112011 =0

原式=2011(2012-2011-1) 、 =2011乘以0 =0

显示屏是12.1英寸

3000~4000

2011x2011+2011/2012x2012+2012 =2011x2011+2011x2012/2012+2012 =2011x2011+2011+2012 =2011x(2011+1)+2012 =2011x2012+2012 =2012x(2011+1) =2012x2012 =4048144

2009x2010x2011x2012+1 =(2009x2012)x(2010x2011)+1 =(2010-1)x(2011+1)x(2010x2011)+1 =(2010x2011-2)x(2010x2011)+1 =(2010x2011-1)x(2010x2011-1)-1+1 =(2010x2011-1)x(2010x2011-1) 所以平方根等于2010x2011-1,这个数自己算吧

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