Salutare!
Cerinta:
"Determinati pe a: [(5 × a + 19) × 7 - 2] : 9 = 34 "
Rezolvare:
[tex]\bf [(5\cdot a+19)\cdot7-2]:9=34[/tex]
[tex]\bf [(5\cdot a+19)\cdot7-2]=34\cdot 9[/tex]
[tex]\bf (5\cdot a+19)\cdot7-2=306[/tex]
[tex]\bf (5\cdot a+19)\cdot7=306+2[/tex]
[tex]\bf (5\cdot a+19)\cdot 7=308[/tex]
[tex]\bf (5\cdot a+19)=308:7[/tex]
[tex]\bf 5\cdot a+19=44[/tex]
[tex]\bf 5\cdot a =44-19[/tex]
[tex]\bf 5\cdot a =25[/tex]
[tex]\bf a =25:5[/tex]
[tex]\boxed{\bf a =5}[/tex]
==pav38==
