化简求值2/3a-{1/3-[(3a²-5a+1)-1/3a-5]}

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化简求值2/3a-{1/3-[(3a²-5a+1)-1/3a-5]}

2/3a-{1/3-[(3a²-5a+1)-1/3a-5]}
=2/3a-1/3+[(3a²-5a+1)+1/3a+5]
=2/3a-1/3+(3a²-5a+1)+1/3a+5
=2/3a-1/3+3a²-5a+1+1/3a+5
=3a²-4a+17/3