this post was submitted on 27 Nov 2025
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Science Memes

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submitted 7 months ago by LadyButterfly@piefed.blahaj.zone to c/science_memes@mander.xyz
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[–] Digit@lemmy.wtf 18 points 7 months ago* (last edited 7 months ago) (3 children)

Hrmm.

I read that as resulting in 21.

My education system did fail me.

I plugged that into ghci as 2+5*(8-5), and it says 17.

:(

I did (2+5)*(8-5).

Doh.

[Edit: (Double doh! Mistyped that here as 5+2. XD)]

[–] A_Chilean_Cyborg@feddit.cl 21 points 7 months ago (2 children)

You do parenthesis first and then multiplications and then sums, you did parenthesis, then sums, then multiplications, wich is wrong.

[–] merc@sh.itjust.works 2 points 7 months ago (1 children)

You don't necessarily have to do parentheses first. What matters is that the things inside the parentheses are a group that you can't break apart. If you have 10÷2+3-2*(2+1) you can do the division first 5+3-2*(2+1) then the addition outside the parentheses 8-2*(2+1) It's just that before you do the multiplication of the term outside the parentheses, you have to handle the parentheses group, so you get 8-2*3 -> 8-6 -> 2

[–] SmartmanApps@programming.dev 0 points 6 months ago

You don’t necessarily have to do parentheses first

Yes, you do necessarily have to do it first

What matters is that the things inside the parentheses are a group that you can’t break apart

And outside, and you must do them first. You haven't finished Brackets until you have 5(8-5)=15.

10÷2+3-2*(2+1) you can do the division first

only because you've separated that part with a plus sign

[–] SmartmanApps@programming.dev -1 points 6 months ago (1 children)

then multiplications

There aren't any, only Addition and Brackets (and Subtraction inside Brackets)

[–] Nils@lemmy.ca 11 points 7 months ago (1 children)

plugged that into ghci as 5+2*(8-5), and it says 17.

You might want to report that error. Or, did you mean 2+5*(8-5)?

[–] Digit@lemmy.wtf 7 points 7 months ago* (last edited 7 months ago) (1 children)

Oops! Typo. School failed me hard!

[Edit: Thanks. Corrected that.]

[–] victorz@lemmy.world 2 points 7 months ago (1 children)

How far along in school are you btw?

[–] Digit@lemmy.wtf 1 points 7 months ago (1 children)

over 20 years past giving up on school [in 2nd year of college], when they kept failing me.

[–] Cavemanfreak@lemmy.dbzer0.com 9 points 7 months ago (1 children)

I did (2+5)*(8-5).

The problem is you can't just add parenthesis willy nilly, that breaks the whole equation!

[–] ivanafterall@lemmy.world -5 points 7 months ago

Well, it used to be a free country until common core and now this nonsense is the result. Numbers and punctuation mixed together. Pure chaos.