NO 17 DENGAN CARANYA TERIMA KASIH 50 poin

Bangun Ruang
- balok

P.rusuk = 156cm
4(p+l+t) = 156
p+l+t = 39
(3x+2)+(x+5)+(2x-4) = 39
6x+3 = 39
6x = 36
x = 6
Maka,
p = 3(6)+2 = 20cm
l = (6)+5 = 11cm
t = 2(6)-4 = 8cm

Volume = p.l.t = 20.11.8 = 1760cm³

17. Jlh. rusuk balok = 4(p + l + t)
156 = 4(3x + 2 + x + 5 + 2x - 4
156 = 4(6x + 3)
156 = 24x + 12
24x = 156 - 12
24x = 144
x = 144/24
x = 6

Panjang, lebar, tinggi balok sebenarnya:
p = 3x + 2 = 3(6) + 2 = 20 cm
l = x + 5 = 6 + 5 = 11 cm
t = 2x - 4 = 2(6) - 4 = 8 cm

V = p.l.t
V = 20 × 11 × 8
V = 1.760 cm³ ✔

[jawaban gak ada di pilihan]