解答
求解 y,x=y9
解答
y=33y,y=−233y+233y3i,y=−233y−233y3i,y=cos(9π)6y32−isin(9π)6y32,y=cos(95π)6y32+isin(95π)6y32,y=cos(911π)6y32+isin(911π)6y32,y=cos(9π)6y32+isin(9π)6y32,y=cos(97π)6y32+isin(97π)6y32,y=cos(913π)6y32+isin(913π)6y32
求解步骤
y=y9
交换两边y9=y
用u=y3 和 u3=y9改写方程式u3=y
解 u3=y:u=3y,u=3y2−1+3i,u=3y2−1−3i
u=3y,u=3y2−1+3i,u=3y2−1−3i
代回 u=y3,求解 y
解 y3=3y:y=33y,y=−233y+233y3i,y=−233y−233y3i
解 y3=3y2−1+3i:y=cos(9π)6y32−isin(9π)6y32,y=cos(95π)6y32+isin(95π)6y32,y=cos(911π)6y32+isin(911π)6y32
解 y3=3y2−1−3i:y=cos(9π)6y32+isin(9π)6y32,y=cos(97π)6y32+isin(97π)6y32,y=cos(913π)6y32+isin(913π)6y32
解为
y=33y,y=−233y+233y3i,y=−233y−233y3i,y=cos(9π)6y32−isin(9π)6y32,y=cos(95π)6y32+isin(95π)6y32,y=cos(911π)6y32+isin(911π)6y32,y=cos(9π)6y32+isin(9π)6y32,y=cos(97π)6y32+isin(97π)6y32,y=cos(913π)6y32+isin(913π)6y32