1.Wyznacz zbiory ,,A\B,B\A jesli A={X:XeN,x=5},B{X:XeC,} 2.Rozwiaz nierównosc a) b) c)-3(x+3)> d) 3.Zapisz w postaci sumy algebraicznej a) b) c) 4.Oblicz a) b) c) d) 5.Usun niewymiernośc z mianownika a) b) 6.Rozwiaz rownanie
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1. A={X:XeN,x=5}
B = {X:XeC,x² <5} Czyli B = {1,2}
AuB = {1,2,5}
AnB = pusty
A\B = {1,2}
B\A = {5}
2.a) ¾x-⅔ > x + ½
¼x <- ⁷/₆
3x <- 28
x < 28/3 = 9 1/3
b) 4(x²-6x+9)-4x²+20x-25 ≥ 2
4x²-24x+36-4x² +20x - 25 ≥ 2
-4x + 11 ≥ 2
-4x ≥ 9
x ≤ -2 1/4
c) -3x+9 > x-5 / -2
6x - 18 > x-5
5x > 13
x > 2 3/5
d) -9(4-4x + x²) - 1 +9x² ≤ 11
-36 + 36x - 9x² - 1 +9x² ≤ 11
-37 + 36x ≤ 11
36x ≤ 48
x ≤ 48/36 = 12/9 = 4/3
3.(2x+1)² = 4x² + 4x+ 1
(4-2x)² = 16 - 16x+4x²
(6+5x)(6-5x) = 36 - 25x²
4. (√3+√2)² = 3+2√6+2 = 5+2√6
(3√2-2)² = 18 - 12√2 + 4 = 22-12√2
(⅓ + √6)(⅓-√6) = ¹/₉ - 6 = -5 ⁸/₉
(2√5-10)² - (2√5+1)(1+2√5)= 20 - 40√5 + 100 - 20 - 2√5 - 1 - 2√5 = 59 - 44√5
z5 a )2 / 1-2√2 * 1+2√2 / 1+2√2 = 2+4√2 / 1-8 = 2+4√2 / -7
b) 16 / √2-√3 * √2+√3 / √2+√3 = 16√2 + 16√3 / 2-3 = -16√2-16√3
6. 9-6x +x² - x²+⅔x -¹/₉ = ²/₉
9-6x+⅔x- ¹/₉ = ²/₉
81 - 54x + 6x - 1 = 2
-48x + 80 = 2
-48x = -78
x= 78/48 = 39/24