-化简求值2/3a-{1/3-[(3a²-5a+1)]},其中a=3
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-化简求值2/3a-{1/3-[(3a²-5a+1)]},其中a=3
![-化简求值2/3a-{1/3-[(3a²-5a+1)]},其中a=3](/uploads/image/z/8831538-18-8.jpg?t=%EF%BC%8D%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%29%5D%7D%2C%E5%85%B6%E4%B8%ADa%3D3)
2/3a-{1/3-[(3a²-5a+1)]}
=2/3a-{1/3-3a²+5a-1}
=2/3a-1/3+3a²-5a+1
=3a²+2/3a-5a-1/3+1
=3a²-13/3a+2/3
=3*3²-13/3*3+2/3
=27-13+2/3
=14+2/3
=46/3
=2/3a-{1/3-3a²+5a-1}
=2/3a-1/3+3a²-5a+1
=3a²+2/3a-5a-1/3+1
=3a²-13/3a+2/3
=3*3²-13/3*3+2/3
=27-13+2/3
=14+2/3
=46/3
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