Jawabanmu

2014-06-05T09:16:52+07:00
Misal :
K = 68 cm, P (2x-5) cm
l (x + 3)
Ditanya : x ?
jwb :
2 . p + 2. l = K
⇔2. (2x-5) + 2. (x+3) = 68
⇔ 4x -10 + 2x +6 = 68
⇔ 4x + 2x =68+10-6
⇔ 6x = 72
⇔ x = 72/6
⇔ x = 12
Jadi, x = 12

Semoga membantu ^^
2014-06-05T09:18:32+07:00
68= 2(2x-5+x+3)
68= 2(3 x-2)
68=6x-4
68+4=6x
72=6x
x=72:6=12