In RPN do we still have to take into note the PEDMAS rules?
For example these questions:
3 – 4 * 2
3 * 4 – 2
3 * (4 – 2)
(3 – 4) * 2
3 – 4 + 2
Answers
342*-
34*2-
---dont know this one
34-2*
342+-
Thanks.
In RPN do we still have to take into note the PEDMAS rules?
For example these questions:
3 – 4 * 2
3 * 4 – 2
3 * (4 – 2)
(3 – 4) * 2
3 – 4 + 2
Answers
342*-
34*2-
---dont know this one
34-2*
342+-
Thanks.
Let's look at what you've got so far:
Algebraic RPN (a) 3 – 4 * 2 3 4 2 * - (b) 3 * 4 – 2 3 4 * 2 - (c) 3 * (4 – 2) [don't know] (d) (3 – 4) * 2 3 4 - 2 * (e) 3 – 4 + 2 3 4 2 + -
Of these, (a), (b), and (d) are correct.
Your expression for (e) will add the 4 and 2, then subtract the result from 3, so its algebraic equivalent would be $3-(4+2)$. To express $3-4+2$ in RPN, the subtraction should happen before the addition, so the -
symbol should appear earlier than the +
symbol. Does this give you enough information to finish it?
For (c), start with the numbers in order, as you have them in all the rest of your expressions: 3 4 2
. Now, what operation happens first? Where does that symbol need to go? What operation is next? Where does that symbol go? (Does this give you enough information?)