X ^ 2 + 1 / X and (x + 1) ^ 2 / 1

X ^ 2 + 1 / X and (x + 1) ^ 2 / 1

1/﹙x²＋x)＝1/x﹙x＋1)＝﹙x＋1)/x﹙x＋1)²
1/﹙x＋1)²＝x/x﹙x＋1)².

It is known that f (x) is a decreasing function defined on (- 1,1), and f (1-2a)

Domain of definition
-1

Positive and negative numbers can be expressed____ The quantity of meaning

A positive number and a negative number can denote quantities in the opposite sense

What do positive and negative numbers mean
It's meaning, not meaning

If a number is greater than zero (> 0), it is said to be a positive number. A positive number can be preceded by a positive sign "+", but when there is no number ahead, the positive sign is usually omitted
Less than zero（