Răspuns:
a) a*V5=V6*15
aV5=V90=3V10
a=3V10:V5
a=3V2
b) a-V18=3V75-a
2a=3V75+V18
2a=3*5V3+3V2 pt ca V75=V25*3=5V3 si V18=V9*2=3V2
a=3(5V3+V2)/2
c)a/V3=a-2
a-a/V3=2
a(1-1/V3)=2
a(V3-1)/V3=2
a=2V3/(V3-1)=2V3(V3+1)/(3-1)
a=V3(V3+1)
d)a^2=1280
a=V1280
a=V2^8*5=2^4V5
a=16V5
2. (a/2)^2=121=11^2
a/2=11
a=2*11
a=22
3. a) 2a+42:(-7) mai mare sau egal cu 0
2a-6≥ 0
2a≥6
a≥6/2
a≥3
b)a-3a≤10
-2a≤5
2a≥5
a≥2,5
c)2a-a/2≤ (a+5)/4
(8a-2a/4)≤(a+5)/4
6a≤a+5
5a≤5
a≤1
4. 2a-V2≤7V2
2a≤7V2+V2
2a≤8V2
a≤4V2
a=4,3,2,1,0
5. a^2≤9
a=3,2,1
6. Vx*16=2
x*16=4
x=1/4
7. x^2+x^3= -1210
x^2(1+x)=-1210
x^2*(1+x)=(-11)^2 *(-10)
x= -11
8. Vx(x+1)=6V2
x(x+1)=72
x(x+1)=8*9
x=8
Explicație pas cu pas:
