Odpowiedź:
zad 4
a)
P = 1/2 * a * (b + 4)
b)
P = 1/2(b + 7) * (c + 1) = 1/2(b + 7)(c + 1)
c)
P = c(d + 18)
d)
P = 1/2 * (d + 1 + a + 2) * 4
e)
P = (a + 3)(a + 3) = (a + 3)²
zad 5
a) 16(a/4 - 0,1 ) = 16/4a + 16 * 0,1 = 4a + 1,6
b) - 1/6(0,5b + 3 ) = - 1/6(1/2b + 3)= - 1/12b - 3/6 = - 1/12b - 1/2
c) - 0,7( 2c - 0,4) = - 1,4c + 0,28
e) 2/5y(20y - 0,5) = 2 * 4y² - 2/5y * 1/2 = 8y² - 2/10y
f) - 1,2z(0,1 - 5z) = - 0,12z + 6
g) - 25 * (3s - 4)/5 = - 5 * (3s - 4) = - 15s + 20
i) 4/5a( - a + 5/4) + a² - 1 = - 4/5a² + 4/5 * 5/4 = - 4/5a² + 1
j) 20b² - 6b + 3b( 2 - 7b) = 20b² - 6b + 6b - 21b² = - 1b²
k) 3(- a + 4) - 1/2( 6 - a) = - 3a + 12 - 6/2 + 1/2a = - 1/2a + 12 - 3 = - 1/2a + 9
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Odpowiedź:
zad 4
a)
P = 1/2 * a * (b + 4)
b)
P = 1/2(b + 7) * (c + 1) = 1/2(b + 7)(c + 1)
c)
P = c(d + 18)
d)
P = 1/2 * (d + 1 + a + 2) * 4
e)
P = (a + 3)(a + 3) = (a + 3)²
zad 5
a) 16(a/4 - 0,1 ) = 16/4a + 16 * 0,1 = 4a + 1,6
b) - 1/6(0,5b + 3 ) = - 1/6(1/2b + 3)= - 1/12b - 3/6 = - 1/12b - 1/2
c) - 0,7( 2c - 0,4) = - 1,4c + 0,28
e) 2/5y(20y - 0,5) = 2 * 4y² - 2/5y * 1/2 = 8y² - 2/10y
f) - 1,2z(0,1 - 5z) = - 0,12z + 6
g) - 25 * (3s - 4)/5 = - 5 * (3s - 4) = - 15s + 20
i) 4/5a( - a + 5/4) + a² - 1 = - 4/5a² + 4/5 * 5/4 = - 4/5a² + 1
j) 20b² - 6b + 3b( 2 - 7b) = 20b² - 6b + 6b - 21b² = - 1b²
k) 3(- a + 4) - 1/2( 6 - a) = - 3a + 12 - 6/2 + 1/2a = - 1/2a + 12 - 3 = - 1/2a + 9