If a<0, lal/a=-a/a=- 1.

Since lal/a+b/lbl=0, A and B have different symbols, namely AB.

(2) If A, B and C are rational numbers, and ab

If a>0, then B.

If a<0, then b>0, c<0, lal/a =- 1, b/LBL = 1, c/LCL =- 1, labcl/ABC = 1, the original formula =

I wish you progress in your study!