It is known that x is a rational number greater than - 2 and less than 3, and the reduction of x = 2 - X - 3

It is known that x is a rational number greater than - 2 and less than 3, and the reduction of x = 2 - X - 3

It is known that x is a rational number greater than - 2 and less than 3, x + 2 > 0, x-3

Given a + B ＜, simplify a + b-1-3-a-b
a+b＜0

∵a+b＜0,
∴-（a+b-1）-|3-（a+b）|
=1-a-b-﹝3-（a+b）﹞
=1-a-b-3+a+b
=1-3=-2
(our format is like this ~)

If the lengths of three sides of triangle ABC are known to be a, B and C respectively, then a-b-c + A + B-C is simplified

(the sum of the two sides is greater than the third side)
A-b-c + A + B-C
= a - (B + C) + A + B-C
＝b+c-a+a+b-c
=2b