一两步或直出答案的不给
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/22 06:51:17
![](http://img.wesiedu.com/upload/7/1e/71ea456c41344349770fd2c1c7d3f342.jpg)
一两步或直出答案的不给
![一两步或直出答案的不给](/uploads/image/z/19440528-24-8.jpg?t=%E4%B8%80%E4%B8%A4%E6%AD%A5%E6%88%96%E7%9B%B4%E5%87%BA%E7%AD%94%E6%A1%88%E7%9A%84%E4%B8%8D%E7%BB%99)
原式可化为:
(2-3x+5y)+(5x-3y-14)i=0
{2-3x+5y=0
{5x-3y-14=0两式相加得:
2(x+y)-12=0
x+y=6
3x+3y=18=2+8y
y=2,x=4
(2)
-1/2+√3/2i=cos120+isin120
原式=cos1200+isin1200=cos(5*360+120)+isin(5*360+120)
=cos120+isin120=-1/2+√3/2i
(2-3x+5y)+(5x-3y-14)i=0
{2-3x+5y=0
{5x-3y-14=0两式相加得:
2(x+y)-12=0
x+y=6
3x+3y=18=2+8y
y=2,x=4
(2)
-1/2+√3/2i=cos120+isin120
原式=cos1200+isin1200=cos(5*360+120)+isin(5*360+120)
=cos120+isin120=-1/2+√3/2i