Question

0,81-х^2=0 Помогите решить

Answer 1

вот решение и ответ

Answer 2

$0.81 - {x}^{2} = 0 \\ - {x}^{2} = - 0.81 \\ {x}^{2} = 0.81 \\ x = 0.9 \\ x = - 0.9$
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