454十999×999十545999十998十997十996十1000十1004十1003十1002十1001

454十999×999十545999十998十997十996十1000十1004十1003十1002十1001.

第1个回答  推荐于2020-12-03
(1)454+999×999+545
=454+999×(1000-1)+545,
=454+999×1000-999+545,
=454+545-999+999000,
=999-999+999000,
=999000;

(2)999+998+997+996+1000+1004+1003+1002+1001.
=(999+1001)+(998+1002)+(997+1003)+(996+1004)+1000,
=2000+2000+2000+2000+1000,
=9000.本回答被提问者采纳
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