Poll: 6÷2(1+2)

[gambitt]

I made it up. If there was to be a logical definition, that's it.

You can't just call 2(1+2) y and then sub in y. Can't you see that is different?

My point was to demonstrate that this is the logic that dowie used for the 9÷3÷3 question.

 

[dowie]

Guys, if an aeroplane is on a treadmill that accelerates at the same speed as the plane, will it take off?

 

[dowie]

My point was to demonstrate that this is the logic that dowie used for the 9÷3÷3 question.

Except it wasn't quite - see my previous post.

http://forums.overclockers.co.uk/showpost.php?p=19016470&postcount=838

 

[muon]

Guys, if an aeroplane is on a treadmill that accelerates at the same speed as the plane, will it take off?

At least we could test that.

Also, isn't the answer no? There is no lift if the plane is still.

 

[feedtheram]

Guys, if an aeroplane is on a treadmill that accelerates at the same speed as the plane, will it take off?

the treadmill will take off but the plane will get bored and go to the kitchen to make a sandwich. it will then watch an episode of the only way is essex and go to bed for an early night.

i worked this out with (maths x science / religion) + brian cox

 

[gambitt]

I've not - I'm applying the same rule to both

'/' or '÷' just applies to the next term

9÷3÷3 can be written as 9*(1/3)*(1/3) = 1

or in the instance of the OP

6÷2(1+2)

can be written as 6*(1/2)(1+2)

Without wanting to repeat myself too many times - this is simply a question of the defention of the operator '÷' or '/' - believe it or not they have been used before and this problem has been considered before.....

*sigh* - it's gone over your head again. Ok, I will break it down for you even more. What is your solution for this one:

1*9÷1*3÷1*3

Unfortunately you seem to have closed your mind up and that is why you are repeating yourself.

 

[BunnyKillBot]

Incorrect.

3x = 3(x) = (3)x = 3*x = 1*3x etc.

There is a big difference between equivalence and simplification

does an apple = a pear

if
an apple = a fruit
and
a pear = a fruit

?

 

[dowie]

At least we could test that.

Also, isn't the answer no? There is no lift if the plane is still.

But if you stand on a treadmill on a pair of roller blades then the force required to....

 

[BunnyKillBot]

At least we could test that.

Also, isn't the answer no? There is no lift if the plane is still.

The answer is yes, there are plenty of youtube videos

 

[gambitt]

There is a big difference between equivalence and simplification

does an apple = a pear

if
an apple = a fruit
and
a pear = a fruit

?

You have deviated from basic algebra to the metaphysical.

 

[sk82jack]

*sigh* - it's gone over your head again. Ok, I will break it down for you even more. What is your solution for this one:

1*9÷1*3÷1*3

Unfortunately you seem to have closed your mind up and that is why you are repeating yourself.

In that instance, personally, I would collect the like terms and end up with

1(9÷3÷3)

And back to the original problem lol

 

[dowie]

*sigh* - it's gone over your head again. Ok, I will break it down for you even more. What is your solution for this one:

1*9÷1*3÷1*3

Unfortunately you seem to have closed your mind up and that is why you are repeating yourself.

I think you're getting a bit confused

If you define an operator like ÷ and present a simple equation then there is only one answer. If you chose to later interpret the operator to mean something else then you can argue about it but it is a bit silly.

FWIW, applying the ÷ operator to the next term the answer to the above is 81

 

[BunnyKillBot]

You have deviated from basic algebra to the metaphysical.

Ok..... To put it more simply, what i am arguing is any term directly before a bracket should be executed in the order step of bodmas not multiplication, because it is specifying the ordered number of a quantity, not the multiplicative equation applied to the quantity.

 

[muon]

The answer is yes, there are plenty of youtube videos

Since this is much more interesting than the Maths question.

Ah of course. A conveyor belt would never be able to actually hold a plane still.

 

[Vonhelmet]

The answer is yes, there are plenty of youtube videos

YouTube videos of a plane on a treadmill? This I gotta see.

 

[BunnyKillBot]

YouTube videos of a plane on a treadmill? This I gotta see.

A to-scale demo would be epic

 

[dowie]

Without wanting to sound like a broken record

1÷2x is the same as writing

1
- * x
2

and it not the same as writing

1
---
2x

That is how '÷' or '/' works and is what people are essentially arguing about within this thread.

 

[gambitt]

FWIW the answer to the above is 81

Thanks, that's all I needed to know. To even have the arrogance to provide a single solution to that mess of algebra has told me all I need to know about the type of person I'm talking to.

 

[sk82jack]

Without wanting to sound like a broken record

1÷2x is the same as writing

1
- * x
2

and it not the same as writing

1
---
2x

That is how '÷' or '/' works and is what people are essentially arguing about within this thread.

I don't agree.

I think that you can't make a definition like that. A '÷' or '/' divides. That's it.

It's then up to you as the user to define what divides what by what by using brackets.

Without brackets there is no right or wrong, just perception.

 

[dowie]

Thanks, that's all I needed to know. To even have the arrogance to provide a single solution to that mess of algebra has told me all I need to know about the type of person I'm talking to.

Type it into a calculator and see if you get a singe answer or an error message.

Surprisingly you'll find that someone has defined the symbol '÷' and therefore there is only a single answer. Maybe calculator manufacturers are arrogant LOL

There isn't anything arrogant about stating something that is correct and your messy equation can still have a simple rule applied to it and an answer given - it isn't complicated despite being silly.