Input 5

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Christian Lawson-Perfect

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Christian Lawson-Perfect

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Ready to use

9 years, 11 months ago

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Christian Lawson-Perfect 9 years, 11 months ago

Gave some feedback: Ready to use

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Christian Lawson-Perfect 11 years, 5 months ago

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Name	Status	Author	Last Modified
Input 5	Ready to use	Christian Lawson-Perfect	01/06/2016 11:03
Numbas Input: Algebraic Fractions	Ready to use	Lois Rollings	27/07/2016 10:57
Input 5	Ready to use	Julie Crowley	26/07/2016 12:52
Julie's copy of Input 5	Ready to use	Julie Crowley	26/07/2016 12:53
Basic Algebraic input for numbas	Ready to use	Julie Crowley	07/10/2016 17:00
Input 5	draft	steve kilgallon	18/08/2016 16:12
Hvordan skrive tall og algebraiske uttrykk inn i Numbas?	draft	Ida Friestad Pedersen	02/11/2016 07:35
ingresar expresiones algebraicas en Numbas	draft	Ricardo Monge	05/10/2017 19:36
Clare's copy of Input 5	draft	Clare Lundon	09/09/2019 08:33

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Question statement

This question concerns ratios of algebraic expressions.

By this we mean expressions of the form $\displaystyle \frac{p(x)}{q(x)}$ where $p(x)$ and $q(x)$ are algebraic expressions.

If you want to input such an expression into the system you HAVE TO BE CAREFUL AND USE BRACKETS or mistakes will occur.

Once again, the box displaying your input in mathematical notation beside the input boxes in parts a, b and c is very useful as it shows what the system thinks you have entered.

Give any introductory information the student needs.

			Name	Type	Generated Value

a	integer	2
c	integer	5
b	integer	15
d	integer	9

Automatically regenerate variables?

Name

Data type

Value

xxxxxxxxxx
 
random(2..16#2)

JME function reference

Description

Describe what this variable represents, and list any assumptions made about its value.

Can an exam override the value of this variable?

Generated value: `integer`

→ Used by:

This variable doesn't seem to be used anywhere.

Parts

Part a) Gap-fill
1. Gap Choose several from a list
  Add
Part b) Gap-fill
1. Gap Mathematical expression
  Add
Part c) Gap-fill
1. Gap Mathematical expression
  Add
Part d) Gap-fill
1. Gap Mathematical expression
  Add

Gap-fill

Ask the student a question, and give any hints about how they should answer this part.

Suppose we wanted to input the expression $\displaystyle \frac{\var{a}+\var{b}x}{\var{c}+\var{d}y}$ into the system.

Which of the following input expressions are incorrect?

Unnamed gap

Choose the incorrect input(s). (You lose 3 marks if you choose the wrong one!)

After you have clicked Submit part, click on Show Feedback and you will be given more detail on your choices.

You can click on Reveal answers at the bottom of the screen to see solutions, but it's best to work through these questions yourself. Remember you can always redo the question by clicking on the Try another question like this one button at the bottom of the screen.

Advice

a)

The correct input is ({a}+{b}x)/({c}+{d}y) - the rest are incorrect and you should have chosen those.

b)

A correct input is ({b} + {a}y) / ({c} + {d}z). Also correct is ({a}y+{b}) / ({c} + {d}z) etc.

c)

A correct input is ({d}z + {b}) / ((x + {a})*(y + {c})).

Note the denominator (the bottom of the ratio) has to have two brackets, i.e. ((x + {a})*(y + {c})) as otherwise the expression ({d}z + {b}) / (x + {a})*(y + {c}) is seen by the system as $\displaystyle \left(\simplify[std]{({d} * z + {b}) / (x + {a})}\right) (y + \var{c})$

d)

A correct input is ({a} -({b}x + {c})*e ^ ( -{2}x)) / ((x + {2*b})*(y -{3*d})).

Give a worked solution to the whole question.

Use this tab to check that this question works as expected.

There was an error which means the tests can't run:

Part	Test	Passed?
Gap-fill
Gap-fill		Hasn't run yet
Choose several from a list
Choose several from a list		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet
Gap-fill
Gap-fill		Hasn't run yet
Mathematical expression
Mathematical expression		Hasn't run yet

This question is used in the following exams:

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Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

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Checkpoint description

Christian Lawson-Perfect 9 years, 11 months ago

Christian Lawson-Perfect 11 years, 5 months ago

Error in variable testing condition

Error

Warning

Generated value: `integer`

Parts

Gap-fill

a)

b)

c)

d)

Loading...

Error

Input 5

Metadata

Taxonomy: mathcentre

Taxonomy: Kind of activity

Taxonomy: Context

Contributors

Feedback

History

Comment

Checkpoint description

Christian Lawson-Perfect 9 years, 11 months ago

Christian Lawson-Perfect 11 years, 5 months ago

Error in variable testing condition

Error

Warning

Generated value: integer

Parts

Gap-fill

a)

b)

c)

d)

Generated value: `integer`