1.
[tex]3x - 2 = 5(x + 1) \\ 3x - 2 = 5x + 5 \\ 3x - 5x = 5 + 2 \\ - 2x = 7 \\ x = - 3.5[/tex]
odp. C
2.
[tex] \frac{x + 3}{2} - \frac{x + 4}{4} = 2 \\ 2x + 6 - x + 4 = 8[/tex]
odp B
3.
[tex] \frac{2}{3} x + x - 2 + x + x - 5 = 37 \\ 3 \times \frac{2}{3} x = 37 + 7 \\ 3 \times \frac{2}{3} x = 44 \\ \frac{11}{3} x = 44 \\ 11x = 132 \\ x = 12[/tex]
czyli boki długości:
10, 12, 7, 8
odp, D
