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]}
![化简求值2/3a-{1/3-[(3a²-5a+1)-1/3a-5]}](/uploads/image/z/8831537-17-7.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC2%EF%BC%8F3a-%7B1%EF%BC%8F3%EF%BC%8D%5B%283a%26%23178%3B-5a%2B1%EF%BC%89%EF%BC%8D1%EF%BC%8F3a%EF%BC%8D5%5D%7D)
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
=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
-化简求值2/3a-{1/3-[(3a²-5a+1)]},其中a=3
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