1999乘以1999除以1998的简便运算

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1999乘以1999除以1998的简便运算
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1999乘以1999除以1998的简便运算
1999乘以1999除以1998的简便运算

1999乘以1999除以1998的简便运算
=(1998+1)*(1999/1998)
=1998*(1999/1998)+1999/1998
=1999+1999/1998
=2000又1/1998

2000.00500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500500

=(1998+1)×(1999/1998)
=1998×(1999/1998)+1999/1998
=1999+1999/1998
=2000又1/1998
这样做很简单吧