Question

1.Determinati solutiile urmatoarelor ecuatii.a)2x+0,5×3,4=7,8;b)5,5×1,9+5x=9,8. 2.Rezolvati ecuatiile.a)0,5x-0,8^2=3,96;b)0,7^3+0,8x=5,023.

Answer 1

a) 2x+1.7=7.8

   2x=7.8-1.7

   2x=6.1

   x=3.05

b) 10.45+5x=9.8

     5x=9.8-10.45

     5x=-0.65

      x=-0.13

a) 0.5x-(8 pe 10)²=3.96

     0.5x-(4 pe 5)²=3.96

     0.5x-16 pe 25=3.96

    0.5x=3.96+16 pe 25

    0.5x=4.6

    x=9.2

b) (7 pe10)³+0.8x=5.023

     343 pe 1000+0.8x=5.023

     0.8x=5.023-0.343

     0.8x=4.68

     x=5.85