Răspuns:
[(4×72-72:8):a+35]×6+12=276
[(288-9):a+35]×6+12=276
(279:a+35)×6+12=276
(279:a+35)×6=276-12
(279:a+35)×6=264
279:a+35=264:6
279:a+35=44
279:a=44-35
279:a=9
a=279:9
a=31
A =31
Explicație pas cu pas:
[(4x72-72:8):A+35]x6+12=276
[(288-9):A+35] x6 =276-12=264
279:A+35=264:6=44
279:A=44-35=9
279:A=9
A=279:9
A=31
