化简求值(a+2)²-2(a+3)(a-2)+(a-3)²其中a=-0.75
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![化简求值(a+2)²-2(a+3)(a-2)+(a-3)²其中a=-0.75](/uploads/image/z/14909503-31-3.jpg?t=%E5%8C%96%E7%AE%80%E6%B1%82%E5%80%BC%28a%2B2%29%26%23178%3B-2%28a%2B3%29%EF%BC%88a-2%EF%BC%89%2B%EF%BC%88a-3%EF%BC%89%26%23178%3B%E5%85%B6%E4%B8%ADa%3D-0.75)
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化简求值(a+2)²-2(a+3)(a-2)+(a-3)²其中a=-0.75
化简求值(a+2)²-2(a+3)(a-2)+(a-3)²其中a=-0.75
化简求值(a+2)²-2(a+3)(a-2)+(a-3)²其中a=-0.75
只能逐项展开了
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收起
=a²+4a+4+-2a²+4a-3a+12+a²-6a+9
=-a+25
=25.75