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L=120 cm^2
l=8cm
p= (3x-3) cm
Jwb:
a) L=p.l
p=L/l
p=120/8
p=15 cm
b)p= 3x-3
15= 3x-3
3x=15+3
3x=18
x=18/3
x= 6
c)K=2(p+l)
K=2(15+8)
K=2.23
K=46 cm
Sekian menurut saya