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Edithlorena33
a fost răspuns

[(ax9)-(78÷2)]+4x25=1492

Răspuns :

HawkEyed
[(ax9)-(78÷2)]+4x25=1492
[(ax9)-(78÷2)]+100=1492
[(ax9)-(78÷2)] =1492- 100
[(ax9)-(78÷2)] = 1392 
9a - 39 = 1392 
9a = 1392 + 39
9a = 1431 
a = 1431 : 9
a = 159 
Hatty
[(a*9)-39]+100=1492
(a*9)-39=1392
a*9=1431
a=1431: 9
a=159