①方程ax²+bx+c=0中a,b,c都是实数,且满足(2-a)²+|c+8|+√a²+b+c=0,求代数式1/2x²+x+1的值.②已知关于x的方程x²+(k+2)x+2k-1=0(1)求证:对于任意实数k,方程总有两个不相等的实数根.(2)当k为
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![①方程ax²+bx+c=0中a,b,c都是实数,且满足(2-a)²+|c+8|+√a²+b+c=0,求代数式1/2x²+x+1的值.②已知关于x的方程x²+(k+2)x+2k-1=0(1)求证:对于任意实数k,方程总有两个不相等的实数根.(2)当k为](/uploads/image/z/692597-29-7.jpg?t=%E2%91%A0%E6%96%B9%E7%A8%8Bax%26%23178%3B%2Bbx%2Bc%3D0%E4%B8%ADa%2Cb%2Cc%E9%83%BD%E6%98%AF%E5%AE%9E%E6%95%B0%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%282-a%29%26%23178%3B%2B%7Cc%2B8%7C%2B%E2%88%9Aa%26%23178%3B%2Bb%2Bc%3D0%2C%E6%B1%82%E4%BB%A3%E6%95%B0%E5%BC%8F1%2F2x%26%23178%3B%2Bx%2B1%E7%9A%84%E5%80%BC.%E2%91%A1%E5%B7%B2%E7%9F%A5%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bx%26%23178%3B%2B%28k%2B2%29x%2B2k-1%3D0%281%29%E6%B1%82%E8%AF%81%3A%E5%AF%B9%E4%BA%8E%E4%BB%BB%E6%84%8F%E5%AE%9E%E6%95%B0k%2C%E6%96%B9%E7%A8%8B%E6%80%BB%E6%9C%89%E4%B8%A4%E4%B8%AA%E4%B8%8D%E7%9B%B8%E7%AD%89%E7%9A%84%E5%AE%9E%E6%95%B0%E6%A0%B9.%282%29%E5%BD%93k%E4%B8%BA)
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