The two rational numbers a and b, whose corresponding points on the number axis are A and B respectively, try to determine whether the number represented by the following formula is positive or negative 1.A 2.b 3.-a 4.a+b 5.a-b 6.-a-b

The two rational numbers a and b, whose corresponding points on the number axis are A and B respectively, try to determine whether the number represented by the following formula is positive or negative 1.A 2.b 3.-a 4.a+b 5.a-b 6.-a-b

One, the question is incomplete. This kind of question will give you a number axis.
Algebraic calculations.
First of all, the positive, negative and absolute values of AB are classified and discussed.

I. The question is incomplete. This kind of question will give you a number axis. You can compare the position of AB original point and the absolute value.
Algebraic calculations.
First of all, the positive, negative and absolute values of AB are classified and discussed.

The position of rational numbers a, b on the number axis is shown in the following figure. How many negative numbers are in (a+b)(a-b),(/a-b/)*(/a/-/b/),3ab ---.B --------------.0---- a.---(number axis) The position of rational numbers a, b on the number axis is shown in the following figure. How many negative numbers are in (a+b)(a-b),(/a-b/)*(/a/-/b/),3ab ---.B ------------.0---- a.---(number axis)

These three are negative numbers!
A + b0
(A+b)(a-b)