다음을 풀어보세요: {l}{a+b+c=21}{a*b*c=231}

a, b, c에 대한 해 (complex solution)

a=21-c-b\text{, }b=-\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\neq 0

a=21-c-b\text{, }b=\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\neq 0

a, b, c에 대한 해

a=21-c-b\text{, }b=-\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\in \mathrm{R}

a=21-c-b\text{, }b=\frac{\sqrt{\left(21c-c^{2}\right)^{2}-924c}}{2c}-\frac{c}{2}+\frac{21}{2}\text{, }c\in \mathrm{R}\text{, }c\neq 0\text{ and }\left(-cc+21c\right)^{2}-924c\geq 0

퀴즈

Algebra

\left. \begin{array} { l } { a + b + c = 21 } \\ { a \cdot b \cdot c = 231 } \end{array} \right.

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