1) 1.5×0.06=0.09√(0.09)= 0.3
2) (2 - √14) × (2 + √(14)= 4-14= -10
3)√(0.3) × √(0.048)= √0.0144 = √ 9/25= 3/25= 0.12
4) (√14 -1) (√14+1)= 14-1=13
5) 7/9 √1 32/49 = 7/9 × 32/49= 7/9 ×32/7 = 1/9 × √32 = 4√2 / 9
6) (√13-2√3) × (√ 13+ 2√3) = 13√13 + 2√39 -26√3 -12
7) (√34 + √46)2 / 20 + √391 = 34+2√1564 +46/ 20 + √391 =
= 34+3√391+ 46 / 20 + √391 = 80 + 4 √391 / 20+√391=
= 4 (20√391) / (20√391) =4 (sokrashayutsa)