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ex. 1 : Se stie ca: ab+ac+a=165 si b+c= 10 Aflati a.
ex. 2 : Se ste ca a+2b+c=51 si 2a+b+2c=42 Aflati a+b+c
ex. 3 : Daca a,b,c sunt numere naturale si a+b+c=18, iar 2a+b+2c+25 , atunci calcualti (a+c)x(3a+2b+3c).
ex. 4 : Calculati: a) 18x37-15x27= b)207+101x32= c) 231+169-16x25= d) 15+23+10x[107+43-(106-16x6)x10]=
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Răspuns :

Nata11
ex.4
a) 18*37-15*27=666-405=261
b)207+101*32=207+3232=3439
c)231+169-16*25=231+169-400=600-400=200
d)15+23+10*[107+43-(106-16*6)*10]=15+23+10*[107+43-(106-96)*10]=38+10*[107+43-10*10]=38+10*[107+43-100]=38+10*50=38+500=538.

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