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既知 きち数 すうではありません
kichisūdewārimasen

敬
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Noun
, 
Desu Copula
, 
Negation Auxiliary

The polite negative form of 既知数

1. It is not a known quantity.; I do not know it.

Negative
, 
Polite
, 
Formal Register
, 
Mathematics

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既知数ではありません

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