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201. Factorise each of the following:
8a³ - b³ - 12a²b + 6ab²

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202. Factorise each of the following:
27 - 125a³ - 135a + 225a²

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203. Factorise each of the following:
64a³ - 27b³ - 144a²* + 108ab²

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204.

Factorise each of the following:

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205. Verify: x³ + y³ = (x + y)(x² - xy + y²)

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206. Verify: x³ - y³ = (x - y)(x² + xy + y²).

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207. Factorise each of the following: 27y³ + 125z³

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208. Factorise each of the following: 64m³ - 343n³.

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209. Factorise: 27x³ + y³ + z³ - 9xyz.

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210. Verify that x³ + y³ + z³ - 3xyz =

1 half

(x + y + z)[(x - y)² + (y - z)² + (z - x)²].

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