√624.98 - ? = √(62.30 + 13.99 – 2.93)
√624.98 - ? = √(62.30 + 13.99 – 2.93) => √625 - ? = √(62 + 14 – 33) => 25 - ? = √(62 + 14 – 27) => 25 - ? = √49 => 25 - ? = 7 => ? = 25 – 7 = 18
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