解決{l}{A=pir^2}{a=r^2}{text{Solvefor}btext{where}}{b=a} |Microsoft數學求解器

$$\left. \begin{array} { l } { A = \pi r ^ {2} }\\ { a = r ^ {2} }\\ { \text{Solve for } b \text{ where} } \\ { b = a } \end{array} \right.$$

解 A、r、a、b (復數求解)

$$r=\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\in \mathrm{C}$$

$$r=-\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\in \mathrm{C}$$

解 A、r、a、b

$$r=-\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\geq 0$$

$$r=\sqrt{b}\text{, }A=\pi b\text{, }a=b\text{, }b\geq 0$$