book Maths Puzzle Numerical Ability

5x^3y+20x^2y^2+20xy^3
all over
5xy

please simplify

note:^ means raised to the power of.

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book Other Question

Can you please help to answer the following question:
.
Sum the series:
1 x 2 x 3 - 2^3 + 3 x 4 x 5 - 4^3 + ... + 9999 x 10000 x 10001 x - 10000^3 please simplfy this
(4x^3-6x^2+5)-(x^2+7x^2-8x-2)