Terms for subject General containing decrease by a factor of 5

English	Chinese
decrease x by a factor of 5	把 x 减少〔降低〕到 x 的 1/5
decrease x by a factor of 1/5	把 x 减少〔降低〕到 x 的 1/5
decrease x by a factor of 1/5	把 x 减少〔降低〕4/5
decrease x by a factor of 5	把 x 减少〔降低〕4/5