已知抛物线y=ax^2+x+2.(1)当a=-1时,求此抛物线的顶点坐标和对称轴;(2)如果代数式-x^2+x+2的值为正整数,求x的值;(3)当a=a1时,抛物线y=ax^2+x+2与x轴的正半轴相交于点M(m,0);当a=a2时,抛物
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![已知抛物线y=ax^2+x+2.(1)当a=-1时,求此抛物线的顶点坐标和对称轴;(2)如果代数式-x^2+x+2的值为正整数,求x的值;(3)当a=a1时,抛物线y=ax^2+x+2与x轴的正半轴相交于点M(m,0);当a=a2时,抛物](/uploads/image/z/405519-15-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bx%2B2.%EF%BC%881%EF%BC%89%E5%BD%93a%3D-1%E6%97%B6%2C%E6%B1%82%E6%AD%A4%E6%8A%9B%E7%89%A9%E7%BA%BF%E7%9A%84%E9%A1%B6%E7%82%B9%E5%9D%90%E6%A0%87%E5%92%8C%E5%AF%B9%E7%A7%B0%E8%BD%B4%EF%BC%9B%EF%BC%882%EF%BC%89%E5%A6%82%E6%9E%9C%E4%BB%A3%E6%95%B0%E5%BC%8F-x%5E2%2Bx%2B2%E7%9A%84%E5%80%BC%E4%B8%BA%E6%AD%A3%E6%95%B4%E6%95%B0%2C%E6%B1%82x%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%883%EF%BC%89%E5%BD%93a%3Da1%E6%97%B6%2C%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bx%2B2%E4%B8%8Ex%E8%BD%B4%E7%9A%84%E6%AD%A3%E5%8D%8A%E8%BD%B4%E7%9B%B8%E4%BA%A4%E4%BA%8E%E7%82%B9M%EF%BC%88m%2C0%EF%BC%89%EF%BC%9B%E5%BD%93a%3Da2%E6%97%B6%2C%E6%8A%9B%E7%89%A9)
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