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则= __________.
已知函数f (x)满足:f ( p + q) = f ( p) f (q),f (1) = 3,则+ +++的值为_______________.
已知函数f(x)满足:f(p+q)= f(p) f(q),f(1)= 3,则的值( )
A.15 B.30 C.75 D.60
已知函数f(x)满足:f(p+q)=f(p)f(q),f(1)=3,则的值为
A.15
B.30
C.75
D.60