February 2019 0 48 Report
1. Wykonaj działania i oblicz wartość liczbową wyrażenia.

a) 3 (x - 1) - 2 = dla x = 4,2
b) 2 (y + 6) - 4 (y - 6) = dla y = 1/2
c) 3 (a - 8) - (5 - 2a) = dla a = -0,5
d) 4 (x - y) - (-x + y) = dla x = 3/2 i y = -1
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