1,1996*19951995-1995*19961996
=1996*1995*10001-1995*1996*10001
=1996*1995*(10001-10001)
=0
2,(-3.14)*35.2+6.28*(-23.3)- 1.57*36.4
=(-3.14)*35.2+(-3.14)*46.6+(-3.14)*18.2
=(-3.14)*(35.2+46.6+18.2)
=-3.14*100
=-314
3,(2008分之一-1)*(2007分之一-1)·····(三分之一-1)*(二分之一-1)
=(-2007/2008)(-2006/2007)...(-2/3)(-1/2)
=-1*2007/2008*2006/2007*...*2/3*1/2
=-1/2008