Explicație pas cu pas:
f)
[tex]x = \frac{2 \times 72}{9} = 2 \times 8 = 16[/tex]
g)
[tex]x = \frac{3 \times 77}{11} = 3 \times 7 = 21[/tex]
h)
[tex]x = \frac{4 \times 65}{13} = 4 \times 5 = 20[/tex]
3.
a)
[tex]2 \times (x + 3) = 7 \times 4 = > 2x + 6 = 28 = > 2x = 22 = > x = 11[/tex]
b)
[tex]3 \times (x + 5) = 9 \times 2 = > 3x + 15 = 18 = > 3x = 3 = > x = 1[/tex]
c)
[tex]3(x - 7) = 4 \times 9 = > 3x - 21 = 36 = > 3x = 15 = > x = 5[/tex]
