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3) Oblicz wartości liczbowe wyrażeń

a) x² - x dla x=7
b) a² - 3a +1 dla a =-4
c) 1 + x(x+4) dla x= -11
d) x - 2 dla x= 1 i y = -1
e) 2x²- y (x+1) dla x = -2 i y = 5
f) (m + 1) ( n-2) dla m = 2 i n =1
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