Enrhifo
10\sqrt{9970}\approx 998.498873309
Rhannu
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10\sqrt{9970}
Ffactora 997000=10^{2}\times 9970. Ailysgrifennu ail isradd y lluoswm \sqrt{10^{2}\times 9970} fel lluoswm ail israddau \sqrt{10^{2}}\sqrt{9970}. Cymryd isradd 10^{2}.
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