2024届衡水金卷先享题临考预测卷数学h试卷答案,我们目前收集并整理关于2024届衡水金卷先享题临考预测卷数学h得系列试题及其答案，更多试题答案请关注微信公众号：趣找答案/直接访问www.qzda.com(趣找答案)

2024届衡水金卷先享题临考预测卷数学h试卷答案

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分析根据题意，由向量的数量积运算性质可得$\overrightarrow{a}$•$\overrightarrow{b}$=3m+4m=7m=7，解可得m的值，即可得$\overrightarrow{a}$、$\overrightarrow{b}$的坐标，由向量的减法运算法则即可得答案．

解答解：根据题意，向量$\overrightarrow{a}$=（m，2），$\overrightarrow{b}$=（3，2m），
则$\overrightarrow{a}$•$\overrightarrow{b}$=3m+4m=7m=7，
解可得m=1，
则$\overrightarrow{a}$=（1，2），$\overrightarrow{b}$=（3，2），
那么$\overrightarrow{b}$-$\overrightarrow{a}$=（2，0）；
故选：D．

点评本题考查平面向量的数量积运算，关键是数量积的运算求出m的值．

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