Odpowiedź:
[tex]a)5x = 4 \times 9 \\ 5x = 36 \\ x = \frac{36}{5} [/tex]
[tex]b)4x = 1.2 \times 1.2 \\ 4x = 1.44 \\ x = 0.36[/tex]
[tex]c)2.8x = 3.2 \times 3.5 \\ 2.8x = 11.2 \\ x = 4[/tex]
[tex]d)9.36x = 1.3 \times 7.2 \\ 9.36x = 9.36 \\ x = 1[/tex]
[tex]e)0.8x = 0.6 \times 6 \\ 0.8x = 3.6 \\ x = 4.5[/tex]
[tex]f)0.8x = 0.6 \times 6 \\ 0.8x = 3.6 \\ x = 4.5[/tex]
[tex]g)(x - 5) \times 5 = 21 \\ 5x - 25 = 21 \\ 5x = 21 + 25 \\ 5x = 46 \\ x = \frac{46}{5} [/tex]
[tex]h)2x = 3(x + 5) \\ 2x = 3x + 15 \\ 2x - 3x = 15 \\ - x = 15 \\ x = - 15[/tex]
[tex]i)4(7 + x) = 5(x + 6) \\ 28 + 4x = 5x + 30 \\ 4x - 5x = 30 - 28 \\ - x = 2 \\ x = - 2[/tex]
[tex]j)3(x - 4) = 2(x - 2) \\ 3x - 12 = 2x - 4 \\ 3x - 2x = - 4 + 12 \\ x = 8[/tex]
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