(Ⅰ)∵f(x)的最小正周期为π,
∴
=π,即ω=2,2π ω
∴f(x)=2sin(2x+φ),
又点(
,2)在函数图象上,得sin(π 8
+φ)=1,π 4
∵|φ|<
,∴φ=π 2
,π 4
则f(x)的解析式为f(x)=2sin(2x+
);π 4
(Ⅱ)由sinA+sinC=
f(
3
2
-B 2
),得sinA+sinC=π 8
sinB,
3
由正弦定理得:a+c=
b,又ac=
3
b2,2 3
由余弦定理得:cosB=
=
a2+c2?b2
2ac
=
(a+c)2?2ac?b2
2ac
=3b2?
b2?b2 4 3
b2
4 3
,1 2
∵0<B<π,∴B=
.π 3