this post was submitted on 27 Nov 2025
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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)]
You do parenthesis first and then multiplications and then sums, you did parenthesis, then sums, then multiplications, wich is wrong.
There aren't any, only Addition and Brackets (and Subtraction inside Brackets)
Uh huh.
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 first5+3-2*(2+1)then the addition outside the parentheses8-2*(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 get8-2*3->8-6->2Yes, you do necessarily have to do it first
And outside, and you must do them first. You haven't finished Brackets until you have 5(8-5)=15.
only because you've separated that part with a plus sign