Question

Afla necunoscuta din următorul exercitiu : 9*[3+4*(15+6*a):18]=81 dau coroana si 40 de puncte !!!!!!plsss plsss

Answer 1

9*[3+4*(15+6*a):18]=81
3+4*(15+6*a):18=81:9
3+4*(15+6*a):18=9
4*(15+6*a):18=9-3
4*(15+6*a)=6*18
4*(15+6*a)=108
15+6*a=108:4
15+6*a=27
15+6*a=27
6*a=27-15
6*a=12
a=12:6
a=2

Answer 2

9×[3+/4(15+6a)/18]=81

9×[3+/2(15+6a)/9]=81

9×[3+/2(5+2a)/3]=81

9×[3+/10+4a/3=81

[3+/10+4a/3=9

3+/10+4a/3=9, a=2.

3+/10+4a/3=-9, a=-23/2.

a₁=-23/2, a₂=2.