问几道关于初一下二元一次方程的题目!1.在代数式x²+ax+b中,当x=2时,它的值为3;当x=-2时,它的值为19,则代数式a-b的值为?2.甲、乙两车从相距150km的两地同时出发,若相向而行,则需3小时相遇,
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![问几道关于初一下二元一次方程的题目!1.在代数式x²+ax+b中,当x=2时,它的值为3;当x=-2时,它的值为19,则代数式a-b的值为?2.甲、乙两车从相距150km的两地同时出发,若相向而行,则需3小时相遇,](/uploads/image/z/3170694-30-4.jpg?t=%E9%97%AE%E5%87%A0%E9%81%93%E5%85%B3%E4%BA%8E%E5%88%9D%E4%B8%80%E4%B8%8B%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%9A%84%E9%A2%98%E7%9B%AE%211.%E5%9C%A8%E4%BB%A3%E6%95%B0%E5%BC%8Fx%26sup2%3B%2Bax%2Bb%E4%B8%AD%2C%E5%BD%93x%3D2%E6%97%B6%2C%E5%AE%83%E7%9A%84%E5%80%BC%E4%B8%BA3%EF%BC%9B%E5%BD%93x%3D-2%E6%97%B6%2C%E5%AE%83%E7%9A%84%E5%80%BC%E4%B8%BA19%2C%E5%88%99%E4%BB%A3%E6%95%B0%E5%BC%8Fa-b%E7%9A%84%E5%80%BC%E4%B8%BA%3F2.%E7%94%B2%E3%80%81%E4%B9%99%E4%B8%A4%E8%BD%A6%E4%BB%8E%E7%9B%B8%E8%B7%9D150km%E7%9A%84%E4%B8%A4%E5%9C%B0%E5%90%8C%E6%97%B6%E5%87%BA%E5%8F%91%2C%E8%8B%A5%E7%9B%B8%E5%90%91%E8%80%8C%E8%A1%8C%2C%E5%88%99%E9%9C%803%E5%B0%8F%E6%97%B6%E7%9B%B8%E9%81%87%2C)
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