Definitely taught in parts of the US, it’s a regional thing though
It's a how good is your Maths teacher (who isn't required to have any Maths qualifications) question. The rules are the same everywhere.
In the US: I highly doubt it
The issue in the U.S. isn't Maths textbooks (same rules as everywhere else), it's poor teaching. U.S. Maths teachers aren't required to have any Maths qualifications, and they've been sliding in world rankings for more than a decade now.
2 + 5(8 - 5) = 2 + (5 × 8) + (5 × -5)
Nope. 2 + 5(8 - 5) = 2 + (5 × 8 - 5 ×5) . a(b+c)=(ab+ac)
then Division or Multiplication
There's neither, only Addition and Brackets (and Subtraction inside Brackets).
8-5= 3 3*5=15
Nope. 2+5(8-5)=2+(40-25), The Distributive Law, a(b+c)=(ab+ac)
This one is just…math
They ALL are
What du you mean, not writing it properly?
They mean they don't remember being taught that is the correct way to write it
it’s like saying 5 apples
5 baskets each with 3 apples actually
I have some bad news for you about your education system
It's not the Education system, it's people not remembering what they were taught
Its because its: 2+5×(8−5)
No it isn't. It's 2+5(8−5). Different expression, but in this case co-incidentally the same answer. Preface the first 5 with a Division and you get different answers.
My calculator app
Was written by a programmer who didn't check the rules of Maths first. The only e-calc I've ever seen give the correct answer is MathGPT
not writing it properly
Except it is written properly, as per Maths textbooks
Brackets have pretty much always been needed
No they aren't. Addition and Subtraction in any order, Multiplication and Division in any order. Only needs brackets if the order matters
Precedences are just made up social constructs
No they're not. They're a natural consequence of the definitions of the operators in the first place.
No you can't! 😂
In other words against the rules of Maths that we have, got it
But it does breakdown if you treat ab as axb 🙄
We explicitly don't have to, because brackets not being needed around a single Term is another explicit rule of Maths, 🙄 being the way everything was written before we started using Brackets in Maths. We wrote things like aa/bb without brackets for many centuries. i.e. they were added on after we had already defined all these other rules centuries before
No it doesn't. If you meant ab², then you would just write ab². If you've written a(b)², then you mean (axb)²
Got nothing to do with the values of b
says person still ignoring all these textbooks
There's no pretending, It's there in the textbooks
You know it's called The Distributive Property of Multiplication over additon, right? And that there's no such thing as The Distributive Property of Multiplication over Multiplication, right? You're just rehashing your old rubbish now