1.已知数列的前4项为4 ,6,8,10,则数列的通项公式为?2.已知向量a=(1,x),b=(-2,4),且a,b夹角为锐角,求实数x取值范围 3.在1,16之间插入三个数a,b,c,使它们成等比,则b为多少?4.在△ABC中,已知sinA:sinB:s
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![1.已知数列的前4项为4 ,6,8,10,则数列的通项公式为?2.已知向量a=(1,x),b=(-2,4),且a,b夹角为锐角,求实数x取值范围 3.在1,16之间插入三个数a,b,c,使它们成等比,则b为多少?4.在△ABC中,已知sinA:sinB:s](/uploads/image/z/3949925-5-5.jpg?t=1.%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%E7%9A%84%E5%89%8D4%E9%A1%B9%E4%B8%BA4+%2C6%2C8%2C10%2C%E5%88%99%E6%95%B0%E5%88%97%E7%9A%84%E9%80%9A%E9%A1%B9%E5%85%AC%E5%BC%8F%E4%B8%BA%3F2.%E5%B7%B2%E7%9F%A5%E5%90%91%E9%87%8Fa%3D%EF%BC%881%2Cx%EF%BC%89%2Cb%3D%EF%BC%88-2%2C4%EF%BC%89%2C%E4%B8%94a%2Cb%E5%A4%B9%E8%A7%92%E4%B8%BA%E9%94%90%E8%A7%92%2C%E6%B1%82%E5%AE%9E%E6%95%B0x%E5%8F%96%E5%80%BC%E8%8C%83%E5%9B%B4+3.%E5%9C%A81%2C16%E4%B9%8B%E9%97%B4%E6%8F%92%E5%85%A5%E4%B8%89%E4%B8%AA%E6%95%B0a%2Cb%2Cc%2C%E4%BD%BF%E5%AE%83%E4%BB%AC%E6%88%90%E7%AD%89%E6%AF%94%2C%E5%88%99b%E4%B8%BA%E5%A4%9A%E5%B0%91%3F4.%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2C%E5%B7%B2%E7%9F%A5sinA%3AsinB%3As)
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