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(15*(-4)+9*7)*2/6 = (-60+63)*2/6 = 6/6 = 1
2. 5x²+8x-21
3. B
1/(√3+1) = (√3-1)/(√3-1)(√3+1) = (√3-1)/3-1 = (√3-1)/2
4.
P = (a*h)/2
2*P = a*h
a = (2*P)/h
5.
4(2-x²)+1- 4x + 4x² = 1
8 - 4x² - 4x + 4x² = 0
4x = 8
x = 2
6.
(x²-2x+1)/3 ≤ 1/3x²-4x
1/3x² - 2/3x + 1/3 ≤ 1/3x² - 4x
10/3x ≤ - 1/3
x ≤ - 1/10
7. D
8.
7(7+2x) = 4*21
7+2x=12
2x = 5
x = 2,5
9.
100*15 = 1500 gr = 15 zł
15-10 = 5 zł
10 zł - 100%
5 zł - x%
x = 50
Zaoszczędzają 5 zł, co stanowi 50% ceny książki.
10.
-1
x > -1
-1
1
Funkcja jest rosnąca.
11. B
13.
|SR| = |AB|
|RP| = |AC|