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Jiangsu Education Press, sixth grade mathematics, Volume II, page 13, answer to the eighth question.
Establish beef cattle

x

head

Then cows have cows.

x( 1+0.25)

formulate

x

+

x( 1+0.25)= 0

900

solve

x

=

celebrity

therefore

Cows have

900-400=500 (head)

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