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y = 2/3 x - 1/3
x = -1 dla y = 2/3 * (-1) - 1/3 = -2/3 - 1/3 = -3/3 = -1
Odp.: A -1
ZADANIE 2
a = 8 cm
Ob = 4a = 32 cm
P = a² = 64 cm²
I. a1 = 10 cm
Ob1 = 4a1 = 40 cm
(40 cm - 32 cm)/32 cm * 100% = 25%
T
II. a2 = 10 cm
P2 = a2² = 10² = 100 cm²
(100 cm² - 64 cm²) / 64 cm² * 100% = 56,25%
N
ZADANIE 3
N A
ZADANIE 4
Pc = 72
Pc = 6a²
72 = 6a² ⇒ a = √12 = 2√3
V = a³ = (2√3)³ = 24√3
d = a√3 = 2√3√3 = 6
12 x 2√3 = 24√3
P / F / P / P
ZADANIE 6
20 cm x 50 cm x 40 cm
V = 40 000 cm³ = 40 l
40 / 10 /25
ZADANIE 8
3√5(√5+x)−2x(x²−3√5) dla x = -√5
3√5(√5 - √5) + 2√5((-√5)²-3√5) = 3√5 x 0 + 2√5(5 - 3√5) = 10√5 - 30 = 10(√5 - 3)