83×83×99=(90-7)�0�5×(100-1)=(8100+49-1260)× 100-(8100+49-1260)×1=6889×100-8100-49+1260=688900-8100-49+1260=682011
83×83×99=83×83×(100-1)=83×83×100-83×83=682011答案:682011.
=83*(1+99)=8300
等于83×3×3×83×11=249×249×11=(250×248+1)×11=(1000×62+1)×11=62001×11=682011
83X83X99=6889X(100-1)=688900-6889=682100