pierwsze: (√5 + 3) * (√5 - 3)
drugie: 2(√7 + 2) * (√7 - 2)
trzecie: (√3 - 2) * (√3 + 2)
Z góry dzięki (:
1.( √5+3) * (√5-3) = (√5)² - 3² = 5-9 = -4
2. 2 (√7+2)*(√7-2) = 2* [(√7)² - 2²] = 2* (7-4) = 2* 3 = 6
3. (√3-2)*(√3+2) = (√3)²-2² = 3-4 = -1
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1.( √5+3) * (√5-3) = (√5)² - 3² = 5-9 = -4
2. 2 (√7+2)*(√7-2) = 2* [(√7)² - 2²] = 2* (7-4) = 2* 3 = 6
3. (√3-2)*(√3+2) = (√3)²-2² = 3-4 = -1