Tolong di jawab pakai cara..Terima kasih

[tex] \frac{a + 1}{2} \times \frac{4}{2a + 2} \\ = \frac{a + 1}{2} \times \frac{4}{2(a + 1)} \\ = \frac{4 \times (a + 1)}{2 \times 2 \times (a + 1)} \\ = \frac{4}{4} = 1[/tex]

maaf kalok salah........