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5. 198 = 2((p*l)+(p*t)+(l*t))
198 / 2 = (p*6)+(p*3)+(6*3)
99 = 6p + 3p + 18
99-18 = 6p+3p
81 = 9p
p = 9
6. 2((p*l)+(p*t)+(l*t)) : 2((p*l)+(p*t)+(l*t))
2 ((6*5)+(6*4)+(5*4)) : 2((8*7)+(8*4)+(7*4)) (angka 2nya coret saja)
(30+24+20) : (56+32+28)
74 : 116
58/37
semoga membantu
luas permukaan = 2 (lbrxtinggi+panjangxtinggi+lebarxpanjang)
198= 2(6x3+Lx3+6xL)
99= 18+6L
81=9L ..... L= 81/9=9