己知a+b=2,求多项式1/4﹙a+b﹚²-9﹙a+b﹚-1/2﹙a+b﹚²+5﹙a+b﹚的值.
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己知a+b=2,求多项式1/4﹙a+b﹚²-9﹙a+b﹚-1/2﹙a+b﹚²+5﹙a+b﹚的值.
![己知a+b=2,求多项式1/4﹙a+b﹚²-9﹙a+b﹚-1/2﹙a+b﹚²+5﹙a+b﹚的值.](/uploads/image/z/19242785-65-5.jpg?t=%E5%B7%B1%E7%9F%A5a%EF%BC%8Bb%3D2%2C%E6%B1%82%E5%A4%9A%E9%A1%B9%E5%BC%8F1%2F4%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%26%23178%3B%EF%BC%8D9%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%EF%BC%8D1%2F2%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%26%23178%3B%EF%BC%8B5%EF%B9%99a%EF%BC%8Bb%EF%B9%9A%E7%9A%84%E5%80%BC.)
1/4﹙a+b﹚²-9﹙a+b﹚-1/2﹙a+b﹚²+5﹙a+b﹚
=-1/4(a+b)²-4(a+b)
=-1/4x2²-4x2
=-1-8
=-9
=-1/4(a+b)²-4(a+b)
=-1/4x2²-4x2
=-1-8
=-9
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