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class="op-item-meat">帆船朝正西方向航行，速度大小為v</span></span> <span id="2hz1lm3" class="op-item"><span id="lnssh1f" class="op-item-nut">C . </span><span id="pbiicob" class="op-item-meat">帆船朝南偏東45°方向航行，速度大小為 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> v</span></span> <span id="axnyiq2" class="op-item"><span id="rtqlkru" class="op-item-nut">D . </span><span id="rabaqrm" class="op-item-meat">帆船朝北偏東45°方向航行，速度大小為 <img class="mathml" src="http://math.21cnjy.com/MathMLToImage?mml=%3Cmath+xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F1998%2FMath%2FMathML%22%3E%3Cmrow%3E%3Cmsqrt%3E%3Cmn%3E2%3C%2Fmn%3E%3C%2Fmsqrt%3E%3C%2Fmrow%3E%3C%2Fmath%3E" style="max-width:100%;vertical-align: middle;"> v</span></span> </div> </div> </div> </li> </ul> <div style="height:20px;background-color: 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