Răspuns :
Răspuns:
[tex]\displaystyle\bf\\a-b= 210\\\\a) \:\: (a +10) - (b+10) = 210\\\\a+10-b-10=210\\\\ \boxed{\displaystyle\bf\\a-b = 210}\\\\b) \:\: (a +10) - (b-10) = 210\\\\a+10-b+10=210\\\\a-b+20=210\\\\a-b= 210 - 20\\\\\boxed{\displaystyle\bf\\a-b=190}\\\\c) \:\: (a -10) - (b+10) = 210\\\\a-10-b-10=210\\\\a-b-20=210\\\\a-b = 210 +20\\\\\boxed{\displaystyle\bf\\a-b = 230}[/tex]