解設冪函數(shù)為y=x^a
由f(x)的圖像經(jīng)過點(2,4/1)
即2^a=1/4
即2^a=2^(-2)
即a=-2
即f(x)=x^(-2)
故f(1/3)=(1/3)^(-2)
=1/(1/3)^(2)
=1/(1/9)
=9做一下13.14.15.16題好嗎?你好,先把我做的題目采納了,然后點擊的圖像,向我求助好嗎?
若冪函數(shù)f(x)的圖像經(jīng)過點(2,4/1)則f(3/1)=?
若冪函數(shù)f(x)的圖像經(jīng)過點(2,4/1)則f(3/1)=?
數(shù)學人氣:808 ℃時間:2020-05-15 09:19:37
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