( V42 - 2 )^2 + 4V42 = 42 - 4V42 + 4 + 4V42 = 42 + 4 = 46
( -4v42 и 4V42 сокращаются )
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( V42 - 2 )^2 + 4V42 = 42 - 4V42 + 4 + 4V42 = 42 + 4 = 46
( -4v42 и 4V42 сокращаются )