Odpowiedź:
Zadanie 7
a) P = a • h
a = 6 cm
h = 3 cm
P = 6 • 3
P = 18 cm2
Obw.: 2 • 5 + 2 • 6 = 10 + 12 = 22 cm
b) P = 1/2 • (a + b) • h
a = 13 cm
b = 5 cm
h = 3 cm
P = 1/2 • (13 + 5) • 3
P = 1/2 • 18 • 3
P = 1/2 • 54
P = 27 cm2
Obw.: 5 + 5 + 5 + 13 = 10 + 18 = 28 cm
Zadanie 8
a) 7m
b) n+n^2/2
c) 2/3k
Zadanie 9
5x - 3 = 4x - 4
5x - 4x = -4 + 3
x = -1
Zadanie 10
2^11 : (2^6 • 2^2)/2^2 = 2^11 : 2^8/2^2 =
= 2^3/2^2 = 2^1 = 2
Pozdrawiam.
