若tan(π-α)=1/3,则tan(x+π/4)等于多少,

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若tan(π-α)=1/3,则tan(x+π/4)等于多少,
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若tan(π-α)=1/3,则tan(x+π/4)等于多少,
若tan(π-α)=1/3,则tan(x+π/4)等于多少,

若tan(π-α)=1/3,则tan(x+π/4)等于多少,
tan(π-α)=-tanα=1/3
则tanα=-1/3
tan(α+π/4)=(tanα+tanπ/4)/(1-tanαtanπ/4)=(-1/3+1)/(1-(-1/3))=1/2.