数学 999乘111加3333乘667 和 1001乘1001减1001 这两个用简便算····很急啊······,巧妙巧算,5050乘5050+8282乘4444
999乘111加333乘667
= 333乘3乘111加333乘667
= 333乘333加333乘667
=333乘(333 667)
=333乘1000
=333000
1001乘1001减1001
=1001乘(1001-1)
=1001乘1000
=1001000
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