Răspuns :
Răspuns:
[tex]300 + 8 * 9 + 2 * [250-3* (28: b +66)] = 452\\\\72+2* [250-3* (28: b +66)] =452-300\\\\2* [250-3* (28: b +66)]=152-72\\\\250-3* (28: b +66)=80:2\\\\3* (28: b +66)=250-40\\\\28: b +66=210:3\\\\28:b=70-66\\\\b=28:4\\\\b=7[/tex]