数学练习 · 焕然一新
Linear functions
把Linear functions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。
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玩法介绍
Linear functions
选一名斗士，挑选Linear functions，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。
Slope is how steep a line is, and it is measured as rise over run: how far the line climbs for every step it takes sideways.
Given two points, subtract the y-values to get the rise and the x-values to get the run, then divide. From (1, 2) to (4, 11): the rise is 11 − 2 = 9, the run is 4 − 1 = 3, so the slope is 3. The line goes up three for every one across.
Order matters only in that you must be consistent — start at the same point for both subtractions, or you will get the sign backwards.
A positive slope climbs to the right, a negative one falls, and a slope of zero is flat. The number is a rate: on a distance-time graph it is speed, on a cost graph it is price per item.
Find the rise, find the run, divide, and type the slope.
— 快问快答 —
Linear functions：精简 FAQ
- Linear functions可以免费玩吗？
- 可以。Linear functions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。
- Linear functions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Linear functions需要下载什么吗？
- 不需要。Linear functions在任何浏览器里都能跑，笔记本、平板或手机都行。
- Linear functions能在课堂上用吗？
- 当然可以。老师带一整个班玩Linear functions，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。