No 14 - 16, Beserta Caranya

Bab Aljabar
Matematika SMP Kelas VII

14] 1/(x + 3) + 4/(2x + 6)
= 1/(x + 3) + 4/(2 (x + 3))
= 1/(x + 3) + 2/(x + 3)
= 3/(x + 3)

15] (x/y - y/x) : (2y/x - 2x/y)
= ((x² - y²)/(xy)) : ((2y² - 2x²)/(xy))
= (x² - y²)/(-2(x² - y²))
= -1/2

16] 2/3 . 3/4 . 4/5 ...... 2015/2016 = n - (2013/2016)

2/2016 = n - (2013/2016)
2/2016 + 2013/2016 = n
n = 2015/2016