September 2018 2 14 Report

1.zapisz bez użycia nawiasów. a)-(x+4) b) -(-2a+5b) c) -(2x-3y) d) -(-a-3b) e) -(-(x+2y) f) -(-2a-3b+c) 2. wiedząc że 3a-2b=a, oblicz 9a-6b= -15a+10b-7


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