What is 6÷2(1+2)? the correct answer explained — steemit

     

That is a classic. The problem is that there is no universal agreement on how to parse expressions with a mix of multiplications và divisions, or with more than one division. Does 1/2a mean 1/(2b) or (1/2)a? It is a matter of convention. Mathematica treats it as (1/2)a, but you may find books where it is meant as 1/(2a), perhaps because this way you save typing parentheses. Usually the ambiguity can be decided from the context, as only one interpretation makes sense. I teach my students to avoid expressions such as a/b/c and always write parentheses lớn make sure they are not misunderstood. There is a Wikipedia article on the "Order of operations".The calculation 6 ÷ 2(1+2) = 6 ÷ 2 + 4 = 7 is a gross mistake in my view.

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Thank you for your response Gianluca,

For my own edification, what context clues would there be khổng lồ solve the equation any other way? Which interpretation makes the most sense in this context? 9 or 1? Would a word problem make this easier lớn understand as well?

Also I very much appreciate any responses in this thread--All of us have access to the same Wikipedia & websites that have greater detail...however for my over users who are obstinate about unreliable sources I wanted lớn come to the most credible place.

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Yes it comes down to lớn whether a space in front of parenthesis in an equation has any significance when parsing a formula. Mathematica doesn"t care & even inserts a space khổng lồ make the formula appear nice. Of course in Mathematice as in many other notations, the multiplication sign can be replaced by a space lượt thích 4 5=45 obviously leaving out the space there would be the number 45. With parenthesis the space might not be necessary 2(1+2) = 2 (1+2)=2(1+2), I have not seen the interpretation 2(1+2)=(2*(1+2)), but it is all a matter of agreed convention.

In:= 6 / 2 (1 + 2)Out= 9When in doubt, the best way to insure clarity one can write out the formula like this:

In:= 6 / 2*(1 + 2)Out= 9In:= 6 / (2*(1 + 2))Out= 1AnswerIt all depends on what they điện thoại tư vấn the precedence of the operators. For Mathematica (bibun.vn Language) the Divide has a higher precedence than Times. So it will first bởi divisions then multiplications:

PrecedencePrecedence470400But in other cases you also have khổng lồ look at how it groups:

6/2/3could be 6/(2/3) or (6/2)/3, giving different answers.

have a look here:

https://reference.bibun.vn.com/language/tutorial/OperatorInputForms.html

To sum up: the author of that equation is just sloppy; you have khổng lồ assume something in order to solve it, & depending on the conventions... So therefore always địa chỉ cửa hàng extra parenthesis to lớn rules out those cases...

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and similarly things lượt thích a^b^c could be (a^b)^c or a^(b^c), so always showroom parenthesis when there is no clear answer. You can avoid part of it by always doing multiplication first và then division:

Thank you all!

All things considered would an appropriate answer be "Need more information to solve" since the tác giả gave no context clues khổng lồ assist?

Yes, without further hints it is not good notation, you need khổng lồ know the rules of the game. It is lượt thích using parenthesis like

*5)we don"t know how to khuyến mãi with that without some extra rules...

Some claim the equation is ambiguous, but the notation is common. It is understood that we apply the Distributive Law in the Parentheses step of PEMDAS. 2(1+2) = (2x1) + (2x2) = 6.

The only number you can divide 6 by to arrive at 9 is 2/3.

2(1+2) != 2/3

2(1+2) == 6

The left lớn right solvers, by replacing implied multiplication with implicit multiplication, are flipping the parenthetical expression to the inverse.

2÷(1+2) == 2/3

Therefore:

6÷2(1+2) != 6÷2*(1+2)

The Desmos online calculator will return the correct answer when using the keypad.

The Casio fx9860GII SD returns the correct answer lớn the equation as given 6÷2(1+2) & provides the alternate notation if you were expecting a result of 9.

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6÷2(2+1), the answer is actually 9.For the people who used this principle x/2y, 2y is obviously together in a group. Polynomials is a simpliest size of an equation the doesn"t need parentheses. For example, if the problem is written as 6÷, in algebraic expression it can easily written as 6÷2y or 6/2y with y=2+1.For the people who said that we should use the distribution, using distribution in 2(2+1) is actually a multiplication method which means you break the rule of PEMDAS that Multiplication & Division are tied in priority which who comes first from left to right should be solve first.1st step: 6÷2(2+1), Inside the parentheses, 6÷2(3), the parentheses sign is indicate a multiplication, eq. Of multiplication signs 2nd Step: 6÷2(3), since () is indicate a multiplication, you can rewrite the problem as 6÷2x3, since Division comes first, used Left khổng lồ Right rule, solve 6÷2=3 3(3) or 3x3 or 3*33rd Step 3(3)=3x3= ****9****.