已知平面上3个向量a,b,c 的模均为1.它们相互间夹角为120度.求证(a-b)垂直于c为什么(a-b)*c=ac-bc=|a||c|cos120-|b||c|cos120=0所以a-b)就垂直c
来源:学生作业帮助网 编辑:作业帮 时间:2024/08/03 15:55:21
![已知平面上3个向量a,b,c 的模均为1.它们相互间夹角为120度.求证(a-b)垂直于c为什么(a-b)*c=ac-bc=|a||c|cos120-|b||c|cos120=0所以a-b)就垂直c](/uploads/image/z/4035040-16-0.jpg?t=%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E4%B8%8A3%E4%B8%AA%E5%90%91%E9%87%8Fa%2Cb%2Cc+%E7%9A%84%E6%A8%A1%E5%9D%87%E4%B8%BA1.%E5%AE%83%E4%BB%AC%E7%9B%B8%E4%BA%92%E9%97%B4%E5%A4%B9%E8%A7%92%E4%B8%BA120%E5%BA%A6.%E6%B1%82%E8%AF%81%EF%BC%88a-b%29%E5%9E%82%E7%9B%B4%E4%BA%8Ec%E4%B8%BA%E4%BB%80%E4%B9%88%28a-b%29%2Ac%3Dac-bc%3D%7Ca%7C%7Cc%7Ccos120-%7Cb%7C%7Cc%7Ccos120%3D0%E6%89%80%E4%BB%A5a-b%29%E5%B0%B1%E5%9E%82%E7%9B%B4c)
xX]o+V۠ג\Ð
(. Cѷpv9rZo 9RۉѺNlN;Fu-$'@JғBϝ!*?
{fs_WO7T~y?~grt|xyp
v?A#3S_O[&c8P]䋋bQh'/gFkK{nOFb6O'к8[v$Sٹ6GwˇkpχWj38£\hrorWkpʕѝr̗fn\CA#ؤW{`t8xtb3L͞2OUu_*
YOCxv ܋˕g/֣'C_E7!]|CJE~YskDK~Y])L՚+^ln}G7wVfɃѭk͖4]Gw,A#s
bnͪ
ݻ{ݯ?p{K }t2^/j8lM<<6I3s}AnbÏ#jUrߖ;KO?*om㨑_[.OoE̦͎ d:djEBg/t/a\vXTtö.҈XH0fr2:<
O$B