8.4 与未知者比较-interactive
Section outline
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Cranes
::起重车Crane Lifting a Large Object Inequalities are used to compare quantities in situations where the quantities may not be equal , meaning that one value is greater or less than another. For example, you can state that -5 is greater than -8. You can also use inequalities to state information about an unknown quantity.
::在数量可能不相等的情况下,用不平等来比较数量,这意味着一个值大于或小于另一个值。例如,您可以声明 -5 大于 -8。您也可以使用不平等来说明未知数量的信息。Discussion Question
::讨论问题A crane can carry a maximum of 18 tons. If a crane is lifting a beam to put on a building, what do we know about the weight of the beam?
::起重机最多可携带18吨。如果起重机举起横梁在建筑物上铺设,那么我们对波束的重量了解多少?
Comparing with an Unknown
::与未知Inequalities are a mathematical concept that rely on verbal rules . Before you learn about the mathematical symbols and statements you can use to represent an inequality , you should first understand the general language used to describe an inequality.
::不平等是一种依赖语言规则的数学概念。在学习数学符号和表达不平等的语句之前,您应该首先理解用来描述不平等的一般语言。Use the interactive to identify possible values for the unknown that make the given statement true.
::使用互动来识别使给定语句变为真实的未知语句的可能值 。INTERACTIVECompare with an Unknown-
Enter a number that satisfies the inequality statement given.
::输入符合所给出不平等声明的编号。 -
Click the button when it appears to try entering new values or answering a new question.
::当似乎尝试输入新值或回答新问题时单击按钮。
+Do you want to reset the PLIX?
Guess the Number
::猜测数字Computers often need to find a specific item in a randomly arranged set of numbers.
::计算机往往需要在随机排列的一组数字中找到具体的项目。Here is a simple example of this: Find the position of the 6 in the following set of numbers.
::以下是一个简单的例子:在以下一组数字中查找 6 的位置。Discussion Questions
::讨论问题 讨论问题-
What strategy did you use to find the six?
::你用什么策略来找到那六个人? -
What if the list had 1,000 or 1,000,000 numbers in it? Would you be able to use the same strategy?
::如果名单上有1 000或1 000万个数字呢?你能采用同样的策略吗?
Computers use algorithms to identify the position of the number as quickly as possible. One possible algorithm involves repeatedly checking whether a number is greater than or less than a randomly chosen number.
::计算机使用算法来尽快识别数字的位置。 一种可能的算法是反复检查数字是否大于或小于随机选择的数字。In the interactive below, you will write inequality statements to determine what number the interactive is thinking of between 1 and 100.
::在下文互动部分,您将撰写不平等声明,以确定互动的1至100之间的人数。INTERACTIVEMystery Number Guessing Game-
Use your knowledge of inequalities to try and guess the correct number between 1 and 100!
::使用您对不平等的知识来猜一到一百之间的正确数字! -
You can narrow down your options by using the "Less Than" and "Greater Than" options, and finally try guessing the exact number itself.
::您可以通过使用“ Less Than” 和“ greater than” 选项缩小选项范围, 最终尝试猜测准确数字本身 。
+Do you want to reset the PLIX?Discussion Question
::讨论问题Which strategies were more effective in helping to identify the mystery number in the fewest guesses? Write out a series of steps that you believe should be followed to find the answer as quickly as possible.
::哪些策略能更有效地帮助识别最小猜想中的神秘数字? 写出一系列你认为应该遵循的步骤,以便尽快找到答案。
Matching Statements
::配对语句For the following interactive, practice writing inequality statements from real world situations.
::对于以下互动活动,实践从现实世界状况中撰写不平等声明。INTERACTIVEMatching Statements-
Choose from the drop down to make the statement correct.
::从下拉中选择, 使语句正确 。 -
Check your answers with the "Check" button.
::用“ 检查” 按钮检查您的答案 。
+Do you want to reset the PLIX?Summary
::摘要When writing i nequality sentences, pay close attention to the language used:
::在撰写不平等判决时,要密切注意所使用的语言:
::包括 x: excludes x: 低于 x: 最无比大于 -
Enter a number that satisfies the inequality statement given.
