Odpowiedź:
1
[tex]8 \times x - 9 = 11 | + 9 \\ 8x = 20 \\ x = \frac{20}{8} = 2 \frac{4}{8} = 2.5 [/tex]
a) NIE b) TAK
2
a)
[tex]x \div 7 = 18 | \times 7\\ x = 126[/tex]
b)
[tex]4 \times x - 12 = 36 | + 12 \\ 4x = 48 \\ x = 12[/tex]
c)
[tex]5 \times x - 1 + 6 \times x = 32 | + 1 \\ 5x + 6x = 33 \\ 11x = 33 \\ x = 3[/tex]
3
a)
[tex]11 \times x - 6 - 7 \times x - 1 \\ 11x - 6 - 7x - 1 \\ 4x - 7[/tex]
b)
[tex]1 \times x + 3 - 9 \times x - 12 \\ x + 3 - 9x - 12 \\ - 8x - 9[/tex]
