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Rozwiążcie nie umiem :( Podręcznik Matematyka 1 nowe wydanie

Zad. 6/158

b)a(a+b+c)-b(a-b+c)-c(a-b-c)

c)x(x ²+2x+1)-(-4x²+8x² -6):2

d)12b*[(b-1):4]+14*[(b²-2b):21]-[(b-b²):3]


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