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计算:3a3·a2-2a7÷a2=   .

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=SUM(Sheet2! A2:A7)  =SUM(Sheet2! A2:Sheet2! A7)  =SUM((Sheet2)A2:A7)  =SUM((Sheet2)A2:(Sheet2)A7)  
(a-b)2=a2-b2    (-a2)3= -a6    x2+x2=x4    3a3·2a2=6a6 。  
=SUM(Sheet2!A2:A7)  =SUM(Sheet2!A2:Sheet2!A7)  =SUM((Sheet2)A2:A7)  =SUM((Sheet2)A2:(Sheet2)A7)  
百合科  泽泻科  樟科  天南星科  
F={A1→A2,A1→A3}   F={A1→A2}   F={A1→A2}   F={A1A3→A2,A1A2→A3}  
1001,1002,1003,2,3,4,1007  2,3,1003,1004,2,3,1007  1001,1002,1003,5,7,11,13  5,7,11,13,1005,1006,1007  
SUM(A2:A6)  A2+A3+A4+A5+A6  =SUM(A2:A6)  =SUM(A2,A6)  
{1001,1002,1003,2,3,4,1007}  {2,3,1003,1004,2,3,1007}  {1001,1002,1003,5,7,11,13}  5,7,11,13,1005,1006,1007  
如果A1=90、A2=人数、A3=…""、A4=54、A5=36,则公式"=Count(A1:A5)"返回5  如果A1=6.28、A2=3.74,其余单元格为空,则公式"=Counta(A1:A7)"的计算结果等于2  如果A1=90、A2=人数、A3=""、A4=54、A5=36,则公式"=Count(A1:A5)"返回3  如果A1=6.28、A2=3.74,其余单元格为空,则公式"=Counta(A1:A7)"的计算结果等于3  
1001,1002,1003,2,3,4,1007  2,3,1003,1004,2,3,1007  1001,1002,1003,5,7,11,13  5,7,11,13,1005,1006,1007  
1001,1002,1003,2,3,4,1007  2,3,1003,1004,2,3,1007  1001,1002,1003,5,7,11,13  5,7,11,13,1005,1006,1007  

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