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No. 9= (4x² + 16x +15) / (2x + 5)
= ((2x + 5) (2x + 3)) / (2x + 5) ............. (2x + 5) / (2x + 5) = 1 atau "bisa dicoret"
= 2x + 3 ........................Jawaban (a)
No. 10
(2x - 6y) / 12 = 2 (x - 3y) / 12
= (x - 3y) / 6 ..................Jawaban (d)
No. 11
(y / 2) + ((x - 3) / 3y) = ((y)(3y) + (2)(x - 3)) / ((2)(3y))
= (3y² + 2x - 6) / 6y ............. Jawaban (a)
No. 12.
(2 / (x + 2)) - (3 / (x + 3)) = ((2(x + 3)) - (3(x + 2)) / ((x + 2)(x + 3)) = (2x + 6 - 3x - 6) / (x +2)(x + 3)
= (- x) / (x + 2)(x + 3)
= - x / (x² + 5x + 6) ..............Jawaban (d)
No. 13
(3ab / 2c) ÷ (9b² / 4ac) = (3ab / 2c) × (4ac / 9b²)
= 12a²bc / 18b²c ........Pembilang dan penyebut dibagi 6bc, hasilnya...
= (12a²bc ÷ 6bc) / (18b²c ÷ 6bc)
= 2a² / 3b ................Jawaban (a)