10000×10002+10001×9999+2000220002/10001×10001-10000×10000
=(10001-1)(10001+1)+(10000+1)(10000-1)+10001*2*10001/10001^2-10000*10000
=10001^2-1+10000^2-1+2-10000^2
=1000110001
10000×10002+10001×9999+2000220002/10001×10001-10000×10000
=(10001-1)(10001+1)+(10000+1)(10000-1)+10001*2*10001/10001^2-10000*10000
=10001^2-1+10000^2-1+2-10000^2
=1000110001