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9x = 45 - 3 + 3
9x = 45
x = 5
2x + 3 = 2.5+3 = 13, 3x = 3.5 = 15, 4x-3 = 4.5-3=17.
sisi terpendek adalah 13.
ditanya : sisi terpendek
keliling = S1 + S2 + S3
45 = 2x + 3 + 3x + 4x - 3
45 - 3 + 3 = 2x + 3x + 4x
45 = 9x
45/9 = x
5 = x
S1 = 2x + 3 = 2.5 + 3 = 13 cm
S2 = 3x = 3.5 = 15 cm
S3 = 4x - 3 = 4.5 - 3 = 17 cm
panjang sisi terpendek = 13 cm
semoga membantu
maaf kalo salah