999又999分之998乘以999

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999又999分之998乘以999
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999又999分之998乘以999
999又999分之998乘以999

999又999分之998乘以999
999又999分之998乘以999=1000*999-999*1/999=999000-1=998999

999+998/999*999
=999*999+998
=998001+998
=998999

999又999分之998乘以999 = 999分之(999*999+998)然后*999 =(998001+998)=998999

原式=1000×999-1/999×999
=999000-1
=998999