数学练习 · 焕然一新
Interest
把Interest变成一场你真正想赢的对决。每道题都是一次攻击——解得比对手快，你就命中一击。
4–99+ 岁皆宜 · 无需下载 · 浏览器即玩 · 23 种语言
玩法介绍
Interest
选一名斗士，挑选Interest，相信你的算力。解得越快越准，出拳就越狠——从轻松的低年级到奥赛级别的挑战，一路升级。
Interest is what money earns for being lent out — or costs for being borrowed. Simple interest is the straightforward version: the same amount is earned every single year, because it is always worked out on the ORIGINAL sum.
Three things decide it. The principal P is what you started with. The rate r is the percentage earned per year. The time t is how many years it sits there. Multiply all three: I = P × r% × t.
Put £400 in at 5% for 3 years. Five percent of 400 is 20, so it earns £20 each year, and over three years that is £60. That is the interest — the account now holds £460, but the question asked what it EARNED, not what it holds. Read carefully which one is wanted.
Real bank accounts usually pay compound interest, where each year's earnings start earning too, so the total creeps ahead of this. Simple interest is the honest first model, and it is still exactly how many loans are quoted.
Find one year's interest, multiply by the number of years, and type the total interest earned.
Interest的所有关卡
— 快问快答 —
Interest：精简 FAQ
- Interest可以免费玩吗？
- 可以。Interest在浏览器里就能免费畅玩——课程全部开放，无需下载、无需注册。付费套餐之后才解锁完整斗士阵容、全部场景和进度保存。
- Interest适合谁玩？
- 4 到 99+ 岁的任何人。低年级对新手依旧平缓，更高的难度则连自信的玩家也得冒汗。
- 玩Interest需要下载什么吗？
- 不需要。Interest在任何浏览器里都能跑，笔记本、平板或手机都行。
- Interest能在课堂上用吗？
- 当然可以。老师带一整个班玩Interest，还能追踪谁在进步——按学生人数计价和教师面板，详见学校套餐。