Răspuns:
2. 1625 3. 4069 4. 5903
Explicație pas cu pas:
215+a+6724-3507 =4984
a=4984-215-6724+3508
a=4769-6724+3580
a=-1955 +3580
a=1625
9543-a-4017+2543=4000
-a=4000-9543+4017-2543
-a=-5543+4017-2543
-a=-1526-2543
-a=-4069
a =4069
a-916-1003-2076=1908
a=1908+916+1003+2076
a=2824+1003+2076
a=3827+2076
a=5903