高等数学 第一章 空间解析几何与向量代数
1.向量设 $\vec a=\lbrace a_x,a_y,a_z \rbrace , \vec b=\lbrace b_x,b_y,b_z\rbrace , \vec c=\lbrace c_x,c_y,c_z\rbrace$向量运算加减：$\vec a \pm \vec b=\lbrace a_x \pm b_x , a_y \pm b_y , a_z \pm b_z \rbrace$
Test
这是一个测试这是一个测试这是一个测试这是一个测试
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