1. Wykonaj działania
a) (3-√7) (2+2√7)
b) (√6-2√3) (2√6+6√3)
2. Oblicz
a) √12· √3
b) √32· √8
c) √10· √40
3. Usuń niewymierność z mianownika
a) ¹/₁√₃
b) ²/₁₋₂√₂
c) ²/√₃
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1. Wykonaj działania
a)
(3-√7) (2+2√7) = 3 * 2 + 3 *2√7 - 2 * √7 - √7 * 2√7 = 6 + 6√7 - 2√7 - 14 = 4√7 - 8
b) (√6-2√3) (2√6+6√3) =
√6 * 2√6 + √6 * 6√3 - 2√3 * 2√6 - 2√3 * 6√3 =
12 + 6√18 - 4√18 - 36 = 2√18 - 24 = 6√2 - 24
2. Oblicz
a) √12· √3 = √(12 * 3) = √36 = 6
b) √32· √8 = √(32 * 8) = √256 = 16
c) √10· √40 = √400 = 20
3. Usuń niewymierność z mianownika
a)
1 1 1 + √3 1*( 1 + √3) 1 + √3 1 + √3
-------- = --------- x --------- = ---------------- = ------------- = - ------------
1 - √3 1 - √3 1 + √3 1² - √3² -2 2
b)
2 2*(1 + 2√2) 2(1 - 2√2) 2(1 - 2√2) 2(1 - 2√2) 2(1 - 2√2)
---------- = ----------------------- = ---------------------- = ---------------- = ------------- = - -------------
1 - 2√2 (1 - 2√2)(1 + 2√2) 1 - (2√2)² 1 - 8 -7 7
c)
2 2 √3 2√3
------ = ----------- x ------- = ----------
√3 √3 √3 3