营业额的年增率是18.82%时,方能超额完成承包计划设当年营业额与前一年营业额的比值为q (q > 1),则25＋25q＋25q^2＝90(1＋q＋q^2)＝90/25＝3.6q^2＋q－2.6＝0根据韦达定理,并舍弃负值∴q＝(-1＋sqrt(1＋4·2.6))/2 ≈...