Odpowiedź:
11)
a) 2/3 * 0,3x = 2/3 * 3/10x = 2/10x = 0,2x
b) -2,7x / 3 = -27/10x * 1/3 = -9/10x = -0,9x
c) 1,1x / 6 = 11/10x * 1/6 = 11/60x = 0,18(3)x
d) y/3 * 3/4 = y/1 * 1/4 = 1/4y = 0,25y
13) - PRAWDA, FAŁSZ
n-1 + n+1 + n+3 = 3n+3
