(1/a+1/b)/2

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(1/a+1/b)/2(1/a+1/b)/2(1/a+1/b)/2(a+b)/2ab绝对正确(a+b)/2ab(2a+2b)/ab

(1/a+1/b)/2
(1/a+1/b)/2

(1/a+1/b)/2
(a+b)/2ab 绝对正确

(a+b)/2ab

(2a+2b)/ab