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5x-1 = 5*(-4)-1 = -20-1 = -21
5*3-1 = 15-1 = 14
5*0-1 = 0-1 = -1
b)
9-5 = 4
9-(-4) = 9+4 = 13
9-0 = 9
c)
4(6-4) = 4*2 = 8
6(6-6) = 6*0 = 0
-1(6-(-1)) = -1*7 = -7
d)
6-2*5 = 6-10 = -4
6-2*(-2) = 6+4 = 10
6-2*1/2 = 6-1 = 5
1/2 - to jest ułamek :) :)