y=sin(x+φ)+√3cos(x+φ)=2[sin(x+φ)/2+√3cos(x+φ)/2]=2sin(x+φ+π/3)为奇函数φ+π/3=kπ函数y在〔0，π /4〕是减函数所以φ+π/3=2kπφ=2kπ-π/3
