√41²-40²

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√41²-40²√41²-40²√41²-40²√41²-40²=√(41+40)(41-40)=√81×1=√81=9

√41²-40²
√41²-40²

√41²-40²
√41²-40²
=√(41+40)(41-40)
=√81×1
=√81
=9