Odpowiedź:
A)
a = x + 4 + x = 2x + 4
h = 5
P = 20
P= 1/2 a • h
P = 1/2 • (2x + 4) • 5
P = (1/2 • 2x + 1/2 • 4) • 5
P = (x + 2) • 5
P = 5x + 10
20 = 5x + 10| - 10
10 = 5x | :5
2 = x
x = 2
B)
Obw = 28
28 = 2x +3x - 2+ x+ 1+ 1 +x + 3x-2
28 = 10x - 2| +2
30 = 10x
x = 3
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Odpowiedź:
A)
a = x + 4 + x = 2x + 4
h = 5
P = 20
P= 1/2 a • h
P = 1/2 • (2x + 4) • 5
P = (1/2 • 2x + 1/2 • 4) • 5
P = (x + 2) • 5
P = 5x + 10
20 = 5x + 10| - 10
10 = 5x | :5
2 = x
x = 2
B)
Obw = 28
28 = 2x +3x - 2+ x+ 1+ 1 +x + 3x-2
28 = 10x - 2| +2
30 = 10x
x = 3