计算:199319922199319912+199319932−2=_.

问题描述:

计算:

199319922
199319912+199319932−2
=______.

∵199319912+199319932-2,
=(19931992-1)2+(19931992+1)2-2,
=199319922+1-2×19931992+199319922+1+2×19931992-2,
=2×199319922

199319922
199319912+199319932−2
=
1
2

故答案为:
1
2