观察下列等式:第1个等式:a 1 = = ×(1﹣ );第2个等式:a 2 = = ×( ﹣ );第3个等式:a 3

2025-03-10 05:27:25
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回答1:

解:根据观察知答案分别为:
(1) ;      
(2) ;  
(3)a 1 +a 2 +a 3 +a 4 +…+a 100
= ×(1﹣ )+ ×( )+ ×( )+ ×( )+…+ ×
= (1﹣ + + + +…+
= (1﹣
= × =