- 猫帽
-
根据题意,简便计算如下
原式=1000*9998-9998-10000*998+998
=1000*(9998-9980)-9000
=1000*18-1000*9
=1000*9
=9000
- 牛云
-
999*9998-998*9999
uff1d999*9999-998*9999uff0d999
uff1duff08999uff0d998uff09x9999-999
=9999-999
=9000
- 小菜G的建站之路
-
999*9998-998*9999
=998*9998+1*9998-998*9999
=998*uff089998-9999uff09+9998
=-998+9998
=9000
- meira
-
999*9998-998*9999
=(1000-1)*(10000-2)-(1000-2)(10000-1)
=1000*10000-10000-2000+2
-(1000*10000-1000-20000+2)
=-10000-2000+1000+20000
=10000-1000
=9000