Odpowiedź:
zad 1
a) 17 * 38 + 17 * 62 = 17(38 + 62) = 17 * 100 = 1700
b) 34 * 18,63 + 34 * 6,37 = 34(18,63 + 6,67) = 34 * 25 = 850
c) 53 * 24,73 - 53 * 9,73 = 53(24,73 - 9,73) = 53 * 15 = 795
d) 49 * 34,6 - 49 * 17,3 + 49 * 2,7 = 49(34,6 - 17,3 + 2,7) = 49 * 20 = 980
zad 2
a) y² - 1/5y) = y(y - 1/5)
b) 4x - 4 = 4(x - 1)
c) 5d - cd = d(5 - c)
zad 3
56x²y² - 42xy + 35x²y
a)
56x²y² - 42xy + 35x²y = 7xy(8xy - 6 + 5x)
b)
56x²y² - 42xy + 35x²y = x(56xy² - 42y + 35xy
c)
56x²y² - 42xy + 35x²y = - 7y(- 8x²y + 6x - 5x²)
