数学练习 · 焕然一新
Inequalities
把Inequalities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
Inequalities
选一名斗士，挑选Inequalities，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。
An equation asks which number makes both sides equal. An inequality asks which numbers make one side SMALLER than the other — and usually there are infinitely many of them.
You solve it exactly like an equation: to get x on its own in 6x < 47, divide both sides by 6, giving x < 7.83…
So every number below 7.83 works — 7 works, 6 works, 0 works, −100 works. But there is a largest WHOLE number that works, and that is 7. Eight is already too big, because 6 × 8 = 48, which is past 47.
A good way to check: multiply your answer back by the coefficient and make sure it lands under the limit, then check that one more would overshoot.
One warning for later: if you ever divide an inequality by a NEGATIVE number, the sign flips direction. That does not happen here, but it is the rule that catches everyone.
Divide, then type the largest whole number that still fits.
— 快问快答 —
Inequalities：精简 FAQ
- Inequalities可以免费玩吗？
- 可以。Inequalities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。
- Inequalities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Inequalities需要下载什么吗？
- 不需要。Inequalities在任何浏览器里都能跑，笔记本、平板或手机都行。
- Inequalities能在课堂上用吗？
- 当然可以。老师带一整个班玩Inequalities，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。