а) 2√7 + √448 - √700 = 2√7 + 4√7 - 10√7 = -4√7
б) √196x - 27√x - √121x = 14√x - 27√x - 11√x = -24√x
в) (√900 + √9) × √9 = (30 + 3) × 3 = 99
г) (√21 + √30) × (√30 - √21) + 6 = (√30)^2 - (√21)^2 + 6 = 30 - 21 + 6 = 15
д) (√7 - √6)^2 + √42 = 7 - 2√42 + 6 + √42 = 13 - √42
а) 2√7 + √448 - √700 = 2√7 + 4√7 - 10√7 = -4√7
б) √196x - 27√x - √121x = 14√x - 27√x - 11√x = -24√x
в) (√900 + √9) × √9 = (30 + 3) × 3 = 99
г) (√21 + √30) × (√30 - √21) + 6 = (√30)^2 - (√21)^2 + 6 = 30 - 21 + 6 = 15
д) (√7 - √6)^2 + √42 = 7 - 2√42 + 6 + √42 = 13 - √42