1令t=x-2,则x=t+2
f(t)=f(x-2)=3(t+2)-5=3t+6-5=3t+1
f(x)=3x+1
2 2x-5=-3,x=1
f(-3)=1+7=8
3对称轴x=b/6≥-2,b≥-12
4由于是偶函数,所以b-3=0,b=3
x∈[2a-3,4-a],2a-3=a-4,a=-1
a+b=2
1令t=x-2,则x=t+2
f(t)=f(x-2)=3(t+2)-5=3t+6-5=3t+1
f(x)=3x+1
2 2x-5=-3,x=1
f(-3)=1+7=8
3对称轴x=b/6≥-2,b≥-12
4由于是偶函数,所以b-3=0,b=3
x∈[2a-3,4-a],2a-3=a-4,a=-1
a+b=2