The position of rational numbers a, b, c on the number axis is shown in the figure.

The position of rational numbers a, b, c on the number axis is shown in the figure.

According to the figure, c >0, a < b <0, then a-b <0, a+b <0,c-a>0, b-c <0,
Original formula =-3(a-b)-(a+b)-(c-a)-2(b-c)
=-3A+3b-a-b-c+a-2b+2c
=-3A+c.

The position of the rational number ab on the number axis is shown in the figure. Find the absolute value of a minus b minus the absolute value of b Figure a 0 b The position of the rational number ab on the number axis is as shown in the figure Find the absolute value of a minus b minus the absolute value of b Figure a 0—b

If a > b, then the absolute value of a-b = a+b, minus the absolute value of b = a;
Ruo a