(-1/3)×(-2/5)×(-13/26)附带过程(-1/3)×(-2/5)×(-13/26)谢谢

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(-1/3)×(-2/5)×(-13/26)附带过程(-1/3)×(-2/5)×(-13/26)谢谢(-1/3)×(-2/5)×(-13/26)附带过程(-1/3)×(-2/5)×(-13/26)谢谢

(-1/3)×(-2/5)×(-13/26)附带过程(-1/3)×(-2/5)×(-13/26)谢谢
(-1/3)×(-2/5)×(-13/26)
附带过程(-1/3)×(-2/5)×(-13/26)谢谢

(-1/3)×(-2/5)×(-13/26)附带过程(-1/3)×(-2/5)×(-13/26)谢谢
=-(2/15)×(1/2)=-1/15