若a

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若a若a若a都小于零?分三种情况讨论:(1)当bI2cI+Ia-bI+Ic-bI-Ic-aI=-2c+a-b+c-b-c+a=2a-2b-2c(2)当a≤bI2cI+Ia-bI+Ic-bI-Ic-aI

若a
若a

若a
都小于零?

分三种情况讨论:
(1)当bI2cI+Ia-bI+Ic-bI-Ic-aI
=-2c+a-b+c-b-c+a=2a-2b-2c
(2)当a≤bI2cI+Ia-bI+Ic-bI-Ic-aI
=-2c+b-a+c-b-c+a=-2c
(3)当aI2cI+Ia-bI+Ic-bI-Ic-aI
=-2c+b-a+b-c-c+a=2b-4c