Răspuns:
Explicație pas cu pas:
Bună !!
•Rezolvarea:
**mai jos↓
•7+3×[2+5×4×(3+2×a)]=313
•3×[2+20×(3+2a)]=313-7
•3×[2+20×(3+2a)]=306
•2+20×(3+2a)=306:3
•2+20×(3+2a)=102
•20×(3+2a)=102-2
•20×(3+2a)=100
•3+2a=100:20
•3+2a=5
•2a=5-3
•2a=2
•a=2:2
•a=1
Succes !!:)
✧✧AndreeaBrainly123✧✧
