短語詞組短語approximate U formula 近似公式approximate inversion formula 近似反縯approximate solution formula 近似計算approximate function formula 近似函數(shù)式approximate analytic formula 近似解析式approximate integral formula 近似積分公式approximate stress formula 近似應力公式an approximate calculation formula 近似計算公式approximate error formula 近似誤差公式 返回 approximate formula