(1)log3(a2+b)=1所以2a+b=3
log3(a5+b)=2所以5a+b=9
a=2,b=-1
f(x)=log3(2x-1)
(2)g(x)=log3[2(x+0.5)-1]-log3 2所以g(x)=log3 x
x>0,F(x)=[log3 x-2][log3 x+1]
令log3 x=t∈[-2,2]
F(t)=t^2-t-2
所以最小值-9/4.最大值4
(1)log3(a2+b)=1所以2a+b=3
log3(a5+b)=2所以5a+b=9
a=2,b=-1
f(x)=log3(2x-1)
(2)g(x)=log3[2(x+0.5)-1]-log3 2所以g(x)=log3 x
x>0,F(x)=[log3 x-2][log3 x+1]
令log3 x=t∈[-2,2]
F(t)=t^2-t-2
所以最小值-9/4.最大值4