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值域即函數值的取值範圍;定義域即(使函數有意義的)引數的取值範圍.比如:函數y=2^x∵y>0【無論x如何取值,y都不能等於0或者小於0】∴這個函數的值域為y∈(0,+∞)而引數x因為能任意取值,所以這個函數的定…
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