Algebraic significance: the absolute value of a positive number is itself, the absolute value of a negative number is its inverse, and the absolute value of 0 is 0.
The absolute values of two opposite numbers are equal.
The absolute value is represented by |a |. It is pronounced as the absolute value of a.
For example, |-2 | is read as the absolute value of -2.
The absolute value of a positive number is itself, the absolute value of a negative number is its opposite number, and the absolute value is non-negative number ≥0.
The absolute value of a special zero is both his own and his opposite number.
|3|=3 |-3|=3
Comparing the sizes of two negative numbers, the absolute value is larger but smaller.
For example, if | 2 (x- 1)-3+| 2y-4) | = 0, then x = _ _ _, and y = _ _ _. (| is the absolute value).
Answer:
2(X- 1)-3=0
X=5/2
2Y-4=0
Y=2
The absolute values of a pair of opposites are equal;
The absolute value of +2 is equal to the absolute value of -2 (because their unit lengths from the origin are equal on the number axis).
Geometric meaning and algebraic meaning of absolute value;
Geometric definition: the distance between the point representing the number A on the number axis and the origin is called the absolute value of the number A. (The distance between the point representing the number A on the number axis and the origin must be non-negative. )
Algebraic definition: | a | = {a>0 a=a
{a0 or =0, and |x-y|=y-x, so x
The registration time of the preliminary contest of the national middle school students' Mathematical Olympiad is mainly concentrated i