[問題] 也是清華89
第二題
Let f(x) be a continuous and decreasing function, and let
g(x) be the inverse function of f. If f(2)=1 and f(4)=0
and
4 1
S f(x)dx=1, then S g(x)dx=_________.
2 0
畫圖看一下，覺得應該沒有固定吧？不知怎麼算~~
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