简便计算题999^2
问题描述:
简便计算题999^2
1.0.125^100x8^100
2.999^2
答
1.0.125^100x8^100
=(0.125*8)^100
=1^100
=1
2.999^2
=(1000-1)^2
=1000^2-2*1000*1+1
=1000000-2000+1
=998001