6/2(1+2)=?

[Meelis]

Hi

What do you think is correct 9 or 1 ?

6/2(1+2)=1
6/2*(1+2)=9

[paco]

Well usually the absence of an operand it interpreted as multiply by default... so I 'd go for 9?

Either that or there is a function 2(x)

[Meelis]

But what's the correct order of calculation?

ofc 1'st is "1+2 = 3"
But is 2'nt in order "6/2" or "2*3"

[zeealpal]

Haha I saw this on facebook.

Even with 6/2(1+2) it is equal to 9, the multiplication still exists even if it is not written.

So using order of operations:
6 / 2 * (3)
= 3 * (3)
= 9

Some people argued that one can bring the 2 into the brackets like this (which is wrong):
6 / 2 (1 + 2)
= 6 / (2*1 + 2*2)
= 6 / (2 + 4)
= 6/6
= 1

Its wrong because if you want to multiply into the brackets and the numbers infront are a * b or a / b, then you must use the whole value before multiplying it into the brackets.
6 / 2 (1 + 2)
= 3 (1 + 2)
= (3 * 1 + 3 * 2)
= 3 + 6
= 9

[zeealpal]

But what's the correct order of calculation?

ofc 1'st is "1+2 = 3"
But is 2'nt in order "6/2" or "2*3"

Multiplication and Division occur at the same time, as read left to right.

So 6 / 2 * 3 we do 6 / 2 first, then 3 * 3

The error in the calculators answer is due to the way it was programmed. Unless it was Photoshopped xD

[Meelis]

The error in the calculators answer is due to the way it was programmed. Unless it was Photoshopped xD

I have at home 2 different scientific calculators (also by Sharp) and i get same 9 and 1 depending on if i write the *.

[zeealpal]

The error in the calculators answer is due to the way it was programmed. Unless it was Photoshopped xD

I have at home 2 different scientific calculators (also by Sharp) and i get same 9 and 1 depending on if i write the *.

Yeah the way it was programmed can't tell that they are the same thing. When I used a Texas Instruments nSpire CAS version, both give the answer nine. So too does WolframAlpha and Google

http://www.wolframalpha.com/input/?i=6%2F2%281%2B2%29

http://www.google.com.au/search?source=ig&hl=en&rlz=1G1GGLQ_ENAU354&q=6%2F2%281%2B2%29&oq=6%2F2%281%2B2%29&aq=f&aqi=g2g-m2&aql=&gs_sm=3&gs_upl=113l630l0l1139l3l3l0l0l0l0l344l466l2.3-1l3l0

[Meelis]

Looks like 9 is correct then

Wow Texas Instruments has such a awesome calculators, i want one

[zeealpal]

They are pretty cool At least mine is a black one, and the CAS version is soo nice (rather than non CAS) as it can solve almost any algebra calculations, factorise etc.. We got to use it for our second maths exam (Maths Methods in Victoria, Australia)

[Pilchard123]

This is why you don't use a linear display on your calculator.