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What is an item? What is the number of items? What is a similar item?
① Item:
In algebra, the simple form is not connected by plus or minus sign
② Number of items:
The total number of numbers in a sequence is the number of items in the sequence
③ Similar items:
Items like 4Y and 5Y, 100ab and 14ab, which contain the same letter and have the same index of the secondary term of the same letter, are called congeneric terms, and all constant terms are congeneric terms
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