вычислите 1+1/1,05+1/1,05^2

1 + 1/1,05 + 1/1,05² = 1 + 1/( 21/20 ) + 1/( 21/20 )² = 1 + 20/21 + 20²/21² = 21/21 + 20/21 + 20²/21² = 41/21 + 20²/21² = ( 41•21 + 20² )/21² = ( 861 + 400 )/21² = 1261/21² = 1261/441 = 2_379/441ОТВЕТ: 2_379/441