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|5 - 7| - |-3 + 4| = (7 - 5) - (4 - 3) = 2 - 1 = 1
Odp. C
2.
12% a = 15% b
0,12a = 0,15b /:0,12
a = 1,25b * 100% = 125b
Odp. B
3.
log100 - log₂ 8 = log10² - log₂ 2³ = 2 - 3 = -1
Odp. B
4.
5x + 3y = 3 |*2
8x - 6y = 48
10x + 6y = 6
8x - 6y = 48
-------------------- +
18x = 54 /:18
x = 3
3y = 3 - 15
3y = -12 /:3
y = -4
{x = 3
{y = -4
Odp. C
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3.
30 000 zł - pierwotna cena
I. obniżka:
30 000 - 0,1 * 30000 = 30000 - 3000 = 27 000 zł
II. obniżka:
27 000 - 0,1 * 27000 = 24 300 zł
Odp. D.
4.
x = 63² * (1/3)⁴ = 3969 * (1/81) = 49 = 7²
Odp. A
5.
x² = (5 + 2√3)² = 25 + 20√3 + 12 = 37 + 20√3
Odp. C
6.
log₅5 - log₅125 = log₅ 5¹ - log₅ 5³ = 1 - 3 = -2
Odp. A