a ^ b ¯ c → a b → c d ← d e f ^ g h i ¯ j k l _ ( a b ) χ / a b \ A B } → X x = − b ± b 2 − 4 a c 2 a {\displaystyle {\hat {a}}\;{\bar {b}}\;{\vec {c}}\;{\overrightarrow {ab}}\;{\overleftarrow {cd}}\;{\widehat {def}}\;{\overline {ghi}}\;{\underline {jkl}}\left({\frac {a}{b}}\right)\chi \left/{\frac {a}{b}}\right\backslash \left.{\frac {A}{B}}\right\}\to X{\color {BrickRed}x}={\frac {{\color {Red}-b}\pm {\sqrt {\color {Magenta}b^{2}-4ac}}}{\color {Green}2a}}} = Gacy
= Gacy
