结论：D可求得f(x)=2sin(2x+π/6)作出f(x)在[0,π]上的图象.它在[0,π]有两解有两种情况:x∈(0,π/3),m∈(1,2)时,x1+x2=2*(π/6)=π/3或x∈(π/3,π),m∈(-2,1)时,x1+x2=2*(2π/3)=4π/3所以 选D希望能帮到你！
