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§8.1 之(?)次方根在垂直坐标系中,点(x,y)与复素数 z=x+iy 一了、应.以原点0为心作一么率圆,内接一正五边形,若一顶为(1,0)则五顶为1及(1/4){-1(?)5~(1/2)±(?)},即(?)_5~c=cos(2cπ/5)+(-1)~(1/2)sin(2cπ/5) (c=1,2,3,4,5),因为((?)_5~c)~5=1,我们叫((?)_5~c)为1之五次方根,但((?)_5~5)~1=1,所以((?)_5~5)不算1之五次原根。((?)_5~2)~1,((?)_5~2)~2,((?)_5~2)~3,((?)_5~2)~4,均(?)1,惟((?)_5~2)~5=1,我们叫((?)_5~2)为1之5次
The root of the § 8.1 (?) in the vertical coordinate system, point (x, y) and the number of complex primes z = x + iy, should. Take the origin 0 as the heart rate circle, inscribed with a positive five Edge shape, if a top is (1,0) then five tops are 1 and (1/4){-1(?)5(1/2)±(?)}, ie (?)_5~c= Cos(2cπ/5)+(-1)~(1/2)sin(2cπ/5) (c=1,2,3,4,5) because ((?)_5~c)~5=1 We call ((?)_5~c) as the root of 1 , but ((?)_5~5)~1=1, so ((?)_5~5) is not counted as five times the original root. . ((?)_5~2)~1,((?)_5~2)~2,((?)_5~2)~3,((?)_5~2)~4, all (?)1, Only ((?)_5~2)~5=1, we call ((?)_5~2) 5 times for 1