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Multiply: ( a/7+(a^2)/9)b y\ (b/2-(b^2...

Multiply: `( a/7+(a^2)/9)b y\ (b/2-(b^2)/3)` `(3x^2y-5x y^2)b y\ (1/5x^2+1/3y^2)`

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(i)`( a/7+(a^2)/9)b y\ (b/2-(b^2)/3)`
`=(-ab)/14+(ab^2)/21+(a^2b)/18-(a^2b^2)/27`

(ii) `(3x^2y-5x y^2)b y\ (1/5x^2+1/3y^2)`
`=(3/5)x^4y+x^2y^3-x^3y^2-(5/3)xy^4`
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