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数式テスト | じょうつよ読書ノート

数式テスト

When \(a \ne 0\), there are two solutions to \(ax^2 + bx + c = 0\) and they are \[x = {-b \pm \sqrt{b^2-4ac} \over 2a}.\]

\[ \displaylines{ \left(x+y\right)^2 &=\left(x+y\right)\left(x+y\right) \\ &=x^2+2xy+y^2 } \]

\[x^{5}-x^{4}-1=x^{5}-x^{4}+x^{3}-x^{3}-1\]

\[\frac{n!}{k!(n-k)!} = \binom{n}{k}\]