计算:(1/a+1/b)•(ab)/a²+2ab+b²
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计算:(1/a+1/b)•(ab)/a²+2ab+b²计算:(1/a+1/b)•(ab)/a²+2ab+b²计算:(1/a+1/b)
计算:(1/a+1/b)•(ab)/a²+2ab+b²
计算:(1/a+1/b)•(ab)/a²+2ab+b²
计算:(1/a+1/b)•(ab)/a²+2ab+b²
(1/a+1/b)•(ab)/a²+2ab+b²
=(a+b)/ab • (ab)/(a+b)^2
= 1/(a+b)