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(