Odpowiedź:
zad 1
a)
a² + b²
b)
(x - y)³
c)
a/4(b + c) = a(b + c)/4
d)
m²/2(k + l)
zad 2
a)
2⁴ab(- 3)a⁵b = 16ab(- 3)a⁵b = - 48a⁶b²
b)
(- 1)⁵x⁴y12xxyy = - x⁴y12x²y² = - 12x⁶y³
zad 3
a)
50 zł - 4a + 5b + k
b)
drugi bok ma długość :
(k - 2z) : 2
zad 4
a)
- (2x + 3y - 2) + (- 4x + 5y - 1) = - 2x - 3y + 2 - 4x + 5y - 1 = - 6x + 2y + 1
b)
- 3(- 5a + 3b - 4) + 2(- 2a - 2b + 8) = 15a - 9b + 12 - 4a - 4b + 16 =
= 11a - 13b + 28
zad 5
a)
1/2(- 2ab³) + 2/3(9a²b) = - ab³ + 2 * 3a²b = - ab³ + 6a²b =
= - (- 8) * (3/4)³ + 6 * (- 8)² * 3/4 = 8 * 27/64 + 6 * 48 * 3/4 =
= 27/8 + 6 * 12 * 3 = 27/8 + 216 = 3 3/4 + 216 = 219 3/4
b)
4(x - y) - (- x + y) = 4x - 4y + x - y = 5x - 5y = 5 * (- 8) - 5 * 3/4 =
= - 40 - 15/4 = - 40 - 3 3/4 = - 43 3/4
