计算102.46^2+0.46^2-2*102.46*0.46-2^2=?

问题描述:

计算102.46^2+0.46^2-2*102.46*0.46-2^2=?

10400
  102.46^2+0.46^2-2*102.46*0.46-2^2
  =(102.46^2+0.46^2-2*102.46*0.46)-2^2
  =(102.46-0.46)^2-2^2
  =102^2-2^2=(102+2)(102-2)
  =10400