∵x∈(-π/3,π/6)
∴3x∈(-π,π/2)
∴3x+π/6∈(-5π/6,2π/3)
∴-1≤sin(3x+π/6)≤1
∴-1/2≤1/2sin(3x+π/6)≤1/2
∴1/2≤1/2sin(3x+π/6)+1≤3/2
∴函数的值域为[1/2,3/2]