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A. -10x(4-x)=-40x+10x^2
B. -10x(x-4)=-40x^2+40x
C. (4-x)(5-2x)=20-2x^2-5x-8x
D. (4-x)(5+2x)=20+8x-5x-2x^2
prawidłowa odpowiedz D