设a1 和a2 为平面上两个长度为1的不共线向量,且它们和的模长满足|a1+a2|=根号3 .则 (2a1-5a2)*(3a1+a2)=?其中a1 a2上面都有矢量箭头
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![设a1 和a2 为平面上两个长度为1的不共线向量,且它们和的模长满足|a1+a2|=根号3 .则 (2a1-5a2)*(3a1+a2)=?其中a1 a2上面都有矢量箭头](/uploads/image/z/5166899-35-9.jpg?t=%E8%AE%BEa1+%E5%92%8Ca2+%E4%B8%BA%E5%B9%B3%E9%9D%A2%E4%B8%8A%E4%B8%A4%E4%B8%AA%E9%95%BF%E5%BA%A6%E4%B8%BA1%E7%9A%84%E4%B8%8D%E5%85%B1%E7%BA%BF%E5%90%91%E9%87%8F%2C%E4%B8%94%E5%AE%83%E4%BB%AC%E5%92%8C%E7%9A%84%E6%A8%A1%E9%95%BF%E6%BB%A1%E8%B6%B3%7Ca1%2Ba2%7C%3D%E6%A0%B9%E5%8F%B73+.%E5%88%99+%282a1-5a2%29%2A%283a1%2Ba2%29%3D%3F%E5%85%B6%E4%B8%ADa1+a2%E4%B8%8A%E9%9D%A2%E9%83%BD%E6%9C%89%E7%9F%A2%E9%87%8F%E7%AE%AD%E5%A4%B4)
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