oblicz warosc liczbową a) 2x -6y dla x= -3y= -1
b) (6x - 7 ) - 3x dla x = jedna trzecia
c) 4p - 2(8p)+5p do potegi drugej dla p =jedna druga
d) 8r - 7s dla r= minus jedna druga S = trzy czwarte
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a) 2 razy (-3) - 6 razy (-1) = -6 - (-6) = -6 +6 = 0
b) (6 razy 1/3 - 7 ) - 3 razy 1/3 = -5 - 1 = -6
c) 2- 8 + 5/2 = 6+5/2 = 8 i 1/2 = 17/2 17/2 do 2 = 72 i 1/4
d) -4 - 21/4 = - 4 - 5 i 1/4 = - 9 i 1/4