1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
问题描述:
1+(-2)+3+(-4)省略号+2001+(-2002)怎么做
答
1+ (-2)+3+(-4)+...+2001+(-2002)
=[1+ (-2)]+[3+(-4)]+...+[2001+(-2002]
=(-1)+(-1)+(-1)+...+(-1)+(-1),[共2002/2=1001个(-1)]
=1001*(-1)
=-1001