Explicație pas cu pas:
1. a+b = 2011
a= b+1053
a+b= 2011 => b+1053+b=2011=>
=>2b=2011-1053 => 2b=958 =>
=> b= 958 : 2=> b = 479
a= b+1053 => a= 479 +1053 =>
=> a= 1532
2. a=b+1
a+b =175 => b+1+b=175 => 2b=175-1 =>
=> 2b = 174 => b= 174: 2 => b = 87
a=b+1 => a=87+1 => a =88
4.a+b=75
a-b=10 => a= 10+b
a+b=75 => 10+b+b=75 => 2b = 75-10 =>
=> 2b = 65 => b = 32,5
a= 10+b => a= 10+32,5=> a = 42,5