二次方程

quadratic equation

two / 2 / (Beijing dialect) stupid

second (i.e. number two) / second time / twice / (math.) quadratic (of degree two)

next in sequence / second / the second (day, time etc) / secondary / vice- / sub- / infra- / inferior quality / substandard / order / sequence / hypo- (chemistry) / classifier for enumerated events: time

square (i.e. x times x)

(raised to the) nth power

surname Fang

square / power or involution (math.) / upright / honest / fair and square / direction / side / party (to a contract, dispute etc) / place / method / prescription (medicine) / just when / only or just / classifier for square things / abbr. for square or cubic meter

mathematical equation

rule / order / regulations / formula / journey / procedure / sequence