比例（交叉乘法）
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Your preference for position of X will be store.
Now we have the calculation of the percentage variation that exists between two values.
Now we have the calculation of the percentage variation that exists between two values.
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關於開發人員
MANUEL FERNANDEZ PARADELA LEDON
mfpledon@gmail.com
R. Prof. Pedreira de Freitas, 372 - apt. 201-C
Tatuapé
SÃO PAULO - SP
03312-052
Brasil
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