start fraction, m, squared, plus, 2, m, n, plus, n, squared, divided by, c, minus, alpha, end fraction, dot, start fraction, c, squared, minus, d, squared, divided by, m, plus, n, end fraction, equals
\frac { m ^ { 2 } + 2 m n + n ^ { 2 } } { c - \alpha } \cdot \frac { c ^ { 2 } - d ^ { 2 } } { m + n } =
求值
\frac{\left(m+n\right)\left(c^{2}-d^{2}\right)}{c-\alpha }
展开
\frac{mc^{2}-md^{2}+nc^{2}-nd^{2}}{c-\alpha }
共享
已复制到剪贴板
示例
二次方程式
{ x } ^ { 2 } - 4 x - 5 = 0
三角学
4 \sin \theta \cos \theta = 2 \sin \theta
线性方程
y = 3x + 4
算术
699 * 533
矩阵
\left[ \begin{array} { l l } { 2 } & { 3 } \\ { 5 } & { 4 } \end{array} \right] \left[ \begin{array} { l l l } { 2 } & { 0 } & { 3 } \\ { -1 } & { 1 } & { 5 } \end{array} \right]
联立方程
\left. \begin{cases} { 8x+2y = 46 } \\ { 7x+3y = 47 } \end{cases} \right.
微分
\frac { d } { d x } \frac { ( 3 x ^ { 2 } - 2 ) } { ( x - 5 ) }
积分
\int _ { 0 } ^ { 1 } x e ^ { - x ^ { 2 } } d x
限制
\lim _{x \rightarrow-3} \frac{x^{2}-9}{x^{2}+2 x-3}