数学练习 · 焕然一新
Expressions
把Expressions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
Expressions
选一名斗士，挑选Expressions，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。
Algebra starts to feel manageable the moment you realise that x is just a thing you are counting.
Five x plus three x is eight x, for exactly the reason five apples plus three apples is eight apples. The letter names WHAT you have; the number in front — the coefficient — says how many. Adding them changes the count and leaves the thing alone.
Terms that share the same letter are called LIKE terms, and only like terms can be combined. 5x + 3y stays as it is, because apples and pears do not add into a single pile.
So the whole skill here is: find the coefficients, add them, and keep the x. The answer is a number of x's, and it is that number you type.
— 快问快答 —
Expressions：精简 FAQ
- Expressions可以免费玩吗？
- 可以。Expressions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。
- Expressions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Expressions需要下载什么吗？
- 不需要。Expressions在任何浏览器里都能跑，笔记本、平板或手机都行。
- Expressions能在课堂上用吗？
- 当然可以。老师带一整个班玩Expressions，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。