【正文】
謝謝觀看 /歡迎下載 BY FAITH I MEAN A VISION OF GOOD ONE CHERISHES AND THE ENTHUSIASM THAT PUSHES ONE TO SEEK ITS FULFILLMENT REGARDLESS OF OBSTACLES. BY FAITH I BY FAITH 。 f (x) = x2 [2 1]; 與 g(x) = 3x +1[1 2 ] 沒有相同的自變量所以不能相加 。 函數(shù) g(x)= 3x +1[1 2]。 例如:如果定義 f (x) = x2; g (x) = 3x+1; G(x) = f (x) + g (x) = x2 + 3x + 1 G(1) = f(1) + g (1) = 12 + 3*1 + 1 當(dāng)函數(shù) f (x) = x2 ; g (x) = 3x+1 函數(shù)相加是在相同的自變量下對(duì)應(yīng)的函數(shù)值的相加 , 后面沒給出定義域范圍內(nèi)時(shí) , 默認(rèn)為該函數(shù)在整個(gè)實(shí)數(shù)軸上是有意義的 。 對(duì)