Odpowiedź:
[tex]2. \: a)4x = 8 \\ x = 8 \div 4 \\ x = 2 \\ 4 \times 2 = 8 \\ b) - 3x = 5 \\ x = 5 \div ( - 3) \\ x = - \frac{5}{3} = - 1 \frac{2}{3} \\ - 3 \times ( - 1 \frac{2}{3} ) = 5[/tex]
[tex]c) - 3 = 2x \\ 2x = - 3 \\ x = - 3 \div 2 \\ x = - 1.5 \\ - 3 = 2 \times ( - 1.5) [/tex]
[tex]d) \frac{1}{4} x = \frac{1}{2} \\ x = \frac{1}{2} \times 4 \\ x = 2 \div \frac{1}{4} \times 2 = \frac{1}{2} [/tex]
[tex]e) \frac{2}{3} x = - 3 \\ x = - 3 \times \frac{3}{2} \\ \times = - 4.5 \\ \frac{2}{3} \times ( - 4.5) = - 3[/tex]
[tex]f)2 \frac{2}{3} = \frac{2}{3} x \\ \frac{2}{3} x = 2 \frac{2}{3} \\ x = \frac{8}{3} \times \frac{3}{2} \\ x = 4 \\ 2 \frac{2}{3} = \frac{2}{3} \times 4 [/tex]
[tex]g)0.2x = 1 \\ x = 1 \div 0.2 \\ x = 5 \\ 0.2 \times 5 = 1[/tex]
