数学文化 第1号2.3.4.5.7.8.10.11.16.17.19.20.23 An element with mass number 81 contains 31.7% more neutronsの詳細情報
An element with mass number 81 contains 31.7% more neutrons。An element with mass number `81` contains `31.7%` more。2023 Putnam Solutions A | PDF | Algebra | Mathematical Analysis。