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b) 2ab² : 6a²b = b/3a
c) (8xy² + 2x) : 4y = 2xy + (x/2y)
d) (5m² - 5n²) : (m² - n²) = 5 (m² - n²) : (m² - n²)
= 5
e) (24ab + 6b) : (12ab - 6a) = 6 (4ab + b) : 6 (2ab - a)
= (4ab + b) / (2ab - a)
9a) (2x + 5)³ = (2x)³ + 3.(2x)² .5 + 3 .(2x).5² + 5³
= 8x³ + 60x² + 150x + 125
b) ( - x + 8)² = x² - 16x + 64
c) (2x - 2y)² = 4x² - 8xy + 4y²
10a) (x + 4)² + (x - 4)² = x² + 8x + 16 + x² - 8x + 16
= 2x² + 32
b) (5 - y)² + (5y - 1)² = 25 - 10y + y² + 25y² - 10y + 1
= 26y² - 20y + 26
c) [ (!/2)x + 2 ]² + [ (1/2)x - 2 ]² = (1/4)x² + 2x + 4 + (1/4)x² - 2x + 4
= (1/2)x² + 8