this post was submitted on 30 Nov 2021
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[–] dragnucs@lemmy.ml 3 points 2 years ago* (last edited 2 years ago) (1 children)

The two equations are different. The order is not the same when writing the multiplication sign and when omitting it. When omitted, it takes precedence.

6÷2×(2+1) ≠ 6÷2(2+1).

Imagine it like a÷bc versus a÷b×c.

The variable "a" is a single term and "bc" is a single term too. "bc" is the same as (b)(c) but not the same as b×c when speaking of operations order.

[–] drop@lemmy.ml 2 points 2 years ago* (last edited 2 years ago)

Hmm interesting. I've never heard that omitting the multiplication sign affects the order of operations. It could be that it's taught differently in different places. I'd probably interpret a/bc as (a/b)*c, though I'd be a bit confused seeing it written without parentheses.