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1993*(1/7-1/2000)+7*(1/1993-1/2000)-2000(1/1993+1/7)+3=?
题目详情
1993*(1/7-1/2000)+7*(1/1993-1/2000)-2000(1/1993+1/7)+3=?
▼优质解答
答案和解析
1993*(1/7-1/2000)+7*(1/1993-1/2000)-2000(1/1993+1/7)+3
=1993/7-1993/2000+7/1993-7/2000-2000/1993-2000/7+3
=(1993-2000)/7-(1993+7)/2000+(7-2000)/1993+3
=-1-1-1+3
=0
=1993/7-1993/2000+7/1993-7/2000-2000/1993-2000/7+3
=(1993-2000)/7-(1993+7)/2000+(7-2000)/1993+3
=-1-1-1+3
=0
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