545 a) x+(x - 5) – x(x – 5) – 42(x - 5);
6) y(y + 3) +9y(y + 3) +20(y + 3);
B) 20 (1 – 0°) - 50(1 - 0?) - 3(1 - 0);
f) 3a²(a² - 4)+ 2a(a? - 4) - a² +4.

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