Question

how do we get the rid of minus and plus problem

Answer 1

if u r confused that where the sign minus will come and where plus will come then look below:
+ + = +
- - = +
- + = -
+ - = -
let me give u a tip.....when the majority of sign will come means if both the sign are same then + will come , and if both are different then - will come

Answer 2

a) ++=+ ; example: 5+5= 10.

b)- - =- ; example: -3-3= -6.

c) -+= either + or -; example: i. -1+5=4; or
ii. -4+2=-2.

d) -*+ = -; example : -1*2=-2.

e) -*- = +; example : -1*-2= 2.

f) -/- = -; example : -2/-2=1

g) -/+ = - ; example: -2/1= -2 or -3/6= -1/2.