Zad. 1.
a) 2x = 100
b) 2y + 4 = 31
c) x:3 = 16
d) 25%x - 9 = 16
e) x - 4 = 16
f) x:2 + 4:2 = 40
Zad. 2.
[tex]a) \: 2x + 2 = 12 \\ 2x = 12 - 2 \\ 2x = 10 \: \: | \div 2 \\ x = 5[/tex]
Ta liczba to 5.
[tex]b) \: \frac{4x - 4}{5} = 4 \: \: | \times 5 \\ \\ 5 \times \frac{4x - 4}{5} = 4 \times 5 \\ 4x - 4 = 20 \\ 4x = 20 + 4 \\ 4x = 24 \: \: | \div 4 \\ x = 6[/tex]
Ta liczba to 6.
