« Formules: Variables dans le texte et dans les équations du texte » : différence entre les versions
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== | ==Utiliser des variables dans le texte== | ||
Il est facile d'insérer des valeurs de variable directement dans le texte. Tout ce qui est nécessaire est d'entourer les noms de variable avec <span style="font-family:monospace;font-size:113%;">{ }</span>. Chaque champ de texte a une portée de variables. Toutes les variables <span style="font-family:monospace;font-size:113%;">x</span> de nombre ou de chaîne dans la portée du texte peuvent être utilisées pour remplacer l'espace réservé <span style="font-family:monospace;font-size:113%;">{x}</span> correspondant dans le texte. | |||
It is also possible to evaluate an expression and insert its value directly in the text by adding an equal sign at the beginning of the bracket such as <span style="font-family:monospace;font-size:113%;">{=x/1000}</span>. This way is simpler if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below: | It is also possible to evaluate an expression and insert its value directly in the text by adding an equal sign at the beginning of the bracket such as <span style="font-family:monospace;font-size:113%;">{=x/1000}</span>. This way is simpler if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below: | ||
Version du 20 janvier 2018 à 02:47
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Utiliser des variables dans le texte
Il est facile d'insérer des valeurs de variable directement dans le texte. Tout ce qui est nécessaire est d'entourer les noms de variable avec { }. Chaque champ de texte a une portée de variables. Toutes les variables x de nombre ou de chaîne dans la portée du texte peuvent être utilisées pour remplacer l'espace réservé {x} correspondant dans le texte.
It is also possible to evaluate an expression and insert its value directly in the text by adding an equal sign at the beginning of the bracket such as {=x/1000}. This way is simpler if the named variables are not required. However, no error check is done unless the question is being instantiated in the quiz. An example is the rescaling of meters to kilometers below:
What is the speed of the rocket if it travels with distance {=x/1000} km in {t} s?
Using variables in text equations
Text equations are mathematical expressions or equations that are displayed in the text using math syntax such as:
See Equation Construction and Display for additional information on writing mathematical expressions.
Values of variables can be inserted in text equations in the same way as in the text, that is, by enclosing the variable names with {}. Values of expressions such as {=x/1000} can also be inserted.
Write the following equation in TeX syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
\( {a} x^2 + {b} x + {c} = 0 \)
Write the following equation in MathML syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»
«mn»{a}«/mn»
«msup»«mi»x«/mi»«mn»2«/mn»«/msup»
«mo»+«/mo»
«mn»{b}«/mn»
«mi»x«/mi»
«mo»+«/mo»
«mn»{c}«/mn»
«mo»=«/mo»
«mn»0«/mn»
«/math»
MathML equations are usually created with the aid of an editor. When creating the equation with an editor, it is easier to write a number, say 99, in lieu of the variables, for example:
«math xmlns=¨http://www.w3.org/1998/Math/MathML¨» «mn»99«/mn» «msup»«mi»x«/mi»«mn»2«/mn»«/msup» «mo»+«/mo» «mn»99«/mn» «mi»x«/mi» «mo»+«/mo» «mn»99«/mn» «mo»=«/mo» «mn»0«/mn» «/math»
and then replace the numbers 99 by the variables {a}, {b} and {c} in the HTML code.
Write the following equation in the AsciiMath syntax. Upon display, {a}, {b} and {c} will be substituted by the value of these variables:
- {a}x2 + {b}x + {c} = 0
<script src="https://cdn.mathjax.org/mathjax/latest/MathJax.js?config=AM_HTMLorMML"></script>
`{a} x^2 + {b} x + {c} = 0`
Use variables and expressions in text equations that appear in the main question text, the general feedback and the part's feedback of a Formulas question. Use MathML syntax.
Downloadable question file: QuadraticEquation.xml
This Formulas question looks like this:
