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efectuati:a)12t-[5t+2-(7+4t)]= b)-3a-[1-5a-4)+6

Răspuns :

a)12t-(5t+2-7-4t) =12t-(t-5) =12-t+5 =11t+5 b)-3a-(1-5a-4)+6 =-3a-(-5a-3)+6 =-3a+5a+3+6 =2a+9