若矢量 overrightarrow (a)+3overrightarrow (b) 垂直于 overrightarrow (a)-5overrightarrow (b), 并且 overrightarrow (a)-4overrightarrow (b) 垂直于-|||-overrightarrow (a)-2overrightarrow (b), 则 lt overrightarrow (a) , overrightarrow (b)gt = () .-|||-

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