(v1+v2)*2 = 7/15 Lv2^2 -4= (4L)v2-v1=2
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![(v1+v2)*2 = 7/15 Lv2^2 -4= (4L)v2-v1=2](/uploads/image/z/14084695-55-5.jpg?t=%EF%BC%88v1%2Bv2%EF%BC%89%2A2+%3D+7%2F15+Lv2%5E2+-4%3D+%284L%29v2-v1%3D2)
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