9-4+2
7^2-2*7-28
2*(6+8)-3*7
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It demonstrates that 1 is the identity element, in some set, for the operation defined by x.
Zero is not equal to one. However, they have a similarity; each one is an identity element in our standard arithmetic (z is an identity element if a*z = a for some operation *). Here,a+0 = aa*1 = a
It means that for certain operations, you can change the order, such that a (operation) b = b (operation) a. For example, for addition: a + b = b + a, and for some types of multiplication, ab = ba.
It is because of convention. It was necessary for some order of operation to be agreed so that wo people carrying out the same calculation would come to the same answer.
In general, the associative property states that "a · (b · c) = (a · b) · c" for some operation "·". In other words, if an operation is associative, the order in which multiple calculations involving it are performed is irrelevant.