已知多项式ax²+bx+mn,当x=0时,它的值是3;当x=1时,它的值是2.(1)2a+2b+3mn=(2)若a≤0,b≤-1/4,且y=a²+b²,则y的取值范围是答案是7;1/2≤y≤1,
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![已知多项式ax²+bx+mn,当x=0时,它的值是3;当x=1时,它的值是2.(1)2a+2b+3mn=(2)若a≤0,b≤-1/4,且y=a²+b²,则y的取值范围是答案是7;1/2≤y≤1,](/uploads/image/z/10188751-31-1.jpg?t=%E5%B7%B2%E7%9F%A5%E5%A4%9A%E9%A1%B9%E5%BC%8Fax%26%23178%3B%2Bbx%2Bmn%2C%E5%BD%93x%3D0%E6%97%B6%2C%E5%AE%83%E7%9A%84%E5%80%BC%E6%98%AF3%EF%BC%9B%E5%BD%93x%3D1%E6%97%B6%2C%E5%AE%83%E7%9A%84%E5%80%BC%E6%98%AF2.%EF%BC%881%EF%BC%892a%2B2b%2B3mn%3D%EF%BC%882%EF%BC%89%E8%8B%A5a%E2%89%A40%2Cb%E2%89%A4-1%2F4%2C%E4%B8%94y%3Da%26%23178%3B%2Bb%26%23178%3B%2C%E5%88%99y%E7%9A%84%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4%E6%98%AF%E7%AD%94%E6%A1%88%E6%98%AF7%EF%BC%9B1%2F2%E2%89%A4y%E2%89%A41%2C)
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