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已知函数等于
A.2a+3b B.3a+2b C.2a + 2b D.3a+3b
已知函数f(x)满足f(xy)=f(x)+f(y),且f(2)=a,f(3)=b,则f(108)等于
A.2a+3b
B.3a+2b
C.a2+b3
D.a3+b2