Question

一道题给出的答案有这样一步：a+4/(2a-b)*b/2=(a-b/2)+b/2+1/(a-b/2)*b/2大于等于3.

Answer 1

可能你打错了,a=(a-b/2)+b/2就不用说了.

4/(2a-b)*b/2分子分母同时除以2=1/(a-b/2)*b/2,我觉得前面的4应该是2

然后运用公式

(a-b/2)+b/2+1/(a-b/2)*b/2≥3³√(a-b/2)(b/2)·1/(a-b/2)*b/2≥3

多做题就熟练