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SBA #119 maths (thelemmy.club)
submitted 4 months ago by to c/lemmyshitpost@lemmy.world
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[–] 7 points 4 months ago* (last edited 4 months ago) (5 children)

my calculator disagrees.

and i would too, this is basically
6÷2(1+2) = 6÷2×(1+2) = 6÷2×3

while you resolve brackets first, you still go left to right. you would get 1 if you did
6÷(2×(1+2))

the issue is the missing multiplication sign between the 2 and the brackets, thats why i always write them even if it is not strictly required

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  • [–] 3 points 4 months ago* (last edited 4 months ago)

    CASIO calculators say 1, and I think it's more intuitive with "÷2π" being equivalent to "÷(2×π)" rather than "÷2×π". It took me a while to figure out why my results were almost but not quite one order of magnitude wrong after I was forced to switch to TI. Obviously nobody in high school or uni wrote ÷ (or Czech :) on paper, it was all fractions, but even on "natural mode" calculators I'd use the ÷ key for simple denominators to save vertical space.

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  • [–] -5 points 4 months ago (3 children)

    you still go left to right

    Unless there's implied multiplication, which there is. Then you do that before the explicit division.

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