√(2,5²-2,4²) =√((2,5- 2,4)*(2,5+2,4)) =
= √(0,1*4,9) =√0,49 =0,7
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√(2,5²-2,4²) =√((2,5- 2,4)*(2,5+2,4)) =
= √(0,1*4,9) =√0,49 =0,7