Răspuns:
Explicație pas cu pas:
1) a)7/4*x-1/2=3
7/4*x=3+1/2=6/2+1/2=7/2
=>(/7)x/4=1/2
=>(*4)x=2
b)|2x+5|=-3=>(Fals) deoarece orice modul este pozitiv
2)-4/9*(2x-4)=48=>4/9*(2x-4)=-48=>(/4) (2x-4)/9=-12=>2x-4=-108
2x=-104=>x=-52
3) bani-5/8*bani=rest1=8/8*bani-5/8*bani=3/8*bani=rest1
rest1-3/5*rest1-15lei=15 lei=>5/5*rest1-3/5*rest1=30 lei
2/5*rest1=30lei=>2*rest1=30lei*5=>rest1=150lei/2=75 lei
3/8*bani=75 lei => bani/8=75 lei/3=> bani=25*8lei=200lei
RASPUNS: 200LEI
