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P = 10 cm
L = x - 2
Luas ≤ 60
maka pertidaksamaannya :
p x l ≤ 60
10 x (x-2) ≤ 60
Penyelesaian :
10 x (x-2) ≤ 60
10x - 20 ≤ 60
10x ≤ 60 + 20
10x ≤ 80
x ≤ 80/10
x ≤ 8