Odpowiedzi

2010-03-03T19:38:41+01:00
1. (√2 - √3) (√2 + √2) = 2-√6
2. (√5 - √2)² = 5-2√10+2=7-2√10
3. (√3 + √7)² = √9+ √49= 3+7=10
4. (√2 + √5 +√8)√2 = √4+√10+√16=2√2+√10+3√2
2010-03-03T19:39:01+01:00
1. (√2 - √3) (√2 + √2) = √4+√4-√6-√6=2+2-2√6=4+2√6

2. (√5 - √2)² = √25- 2*√5*(-√2)+√4 = 5-2√5*(-√2)+2 = 5 +4√5+2 = 7+4√5

3. (√3 + √7)² = √9-2*√3*√7+√49=3-2*√21+7=10-2√21

4. (√2 + √5 +√8)√2 =√4+√10+√16=2+√10+4=6+√10