a除以3a-1加上3a除以1-3a减去a-1除以3a-1

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a除以3a-1加上3a除以1-3a减去a-1除以3a-1
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a除以3a-1加上3a除以1-3a减去a-1除以3a-1
a除以3a-1加上3a除以1-3a减去a-1除以3a-1

a除以3a-1加上3a除以1-3a减去a-1除以3a-1
a/(3a-1)+3a/(1-3a)+(a-1)/3a-1
=1/(3a-1)+3a/(1-3a)
=-(3a-1)/(3a-1)
=-1