计算:199319922199319912+199319932−2=_.
问题描述:
计算:
=______. 199319922
199319912+199319932−2
答
∵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