问题标题:
【(X+1)(X+3)分之2+(X+3)(X+5)分之2+(X+5)(X+7)分之2+(X+7)(X+9)分之2的值是多少】
问题描述:
(X+1)(X+3)分之2+(X+3)(X+5)分之2+(X+5)(X+7)分之2+(X+7)(X+9)分之2的值是多少
刘祯回答:
=1/(x+1)-1/(x+3)+1/(x+3)-1/(x+5)+……+1/(x-7)-1/(x+9)=1/(x+1)-1/(x+9)=(x+1)(x+9)分之8
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