问题标题:
[1/(a平方-3a+2]+[1/(a平方-5a+6)]+[1/(a平方-3a+12)]等于多少,快
问题描述:
[1/(a平方-3a+2]+[1/(a平方-5a+6)]+[1/(a平方-3a+12)]等于多少,快
曹艳回答:
[1/(a平方-3a+2]+[1/(a平方-5a+6)]+[1/(a平方-7a+12)]最后一个3换成7=1/(a-1)(a-2)+1/(a-2)(a-3)+1/(a-3)(a-4)=[(a-1)-(a-2)]/(a-1)(a-2)+[(a-2)-(a-3)]/(a-2)(a-3)+[(a-3)-(a-4)]/(a-3)(a-4)=1/(a-2)-1/(a-1)+...
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