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(b:9)+48=57 cum rezolv ???

Răspuns :

b : 9 + 48=57
b:9=57 - 48
b :9 =9
b=9•9
b=81
(b:9)+48=57
a+48=57
a=57-48
a=9
b:9=9
b=9x9
b=81
(81:9)+48=57
9+48=57