化简求值:(a²+3a)(a-3)-a(a-2)²+(a+2)(a-2),其中a=-1/5
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![化简求值:(a²+3a)(a-3)-a(a-2)²+(a+2)(a-2),其中a=-1/5](/uploads/image/z/1076272-16-2.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%3A%28a%26%23178%3B%2B3a%29%28a-3%29-a%28a-2%29%26%23178%3B%2B%28a%2B2%29%28a-2%29%2C%E5%85%B6%E4%B8%ADa%3D-1%2F5)
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化简求值:(a²+3a)(a-3)-a(a-2)²+(a+2)(a-2),其中a=-1/5
化简求值:(a²+3a)(a-3)-a(a-2)²+(a+2)(a-2),其中a=-1/5
化简求值:(a²+3a)(a-3)-a(a-2)²+(a+2)(a-2),其中a=-1/5
原式=a³-9a-a³+4a²-4a+a²-4
=5a²-13a-4
当a=-1/5时
5a²-13a-4=5×(-1/5)²-13×(-1/5)-4=5×1/25+13/5-4=6/5