Terms containing reduce by a factor of 5

Subject	English	Chinese
gen.	reduce M by a factor of 5	把 M 减少到原来的 1/5〔减少4/5〕
gen.	reduce x by a factor of 1/5	把 x 减少〔降低〕4/5
gen.	reduce x by a factor of 1/5	把 x 减少〔降低〕到 x 的 1/5
gen.	reduce x by a factor of 5	把 x 减少〔降低〕到 x 的 1/5
gen.	reduce x by a factor of 5	把 x 减少〔降低〕4/5