短語詞組短語ternary quartic diophantine equation 三元四次Diophantine方程quartic congruential equation 次同餘方程quartic diophantine equation 四次diophantine方程quartic indeterminate equation 四次不定方程cubic and quartic equation 三nonlinear quartic equation 非線性四堦方程mathematical quartic equation 四類數(shù)理方程the quartic equation 四次方 返回 quartic equation