反逆の魔王ろーすぺでち is a user on flower.afn.social. You can follow them or interact with them if you have an account anywhere in the fediverse. If you don't, you can sign up here.
反逆の魔王ろーすぺでち @kVg3TQeU

エクセルでの数値計算は浮動小数点だからこわいなあ