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b) 12x+5xy+8x² = x (12+5y+8x)
c) 5a² +15a+20a³ = 5a (a + 3+ 4a²)
d) 8a³-4a² -8a+4 = 4 (2a³-a²-2a+1)
e) -3k-6k³-18klm = -3k (1 + 2k² + 6lm)
f) -0,25x-0,75y-1,5 = - 0,25 (x+3y+6)
g) 5a+0,49 +10abc = nie wiem :(
h) 10x(do czwartej)+50x² -100x³= 10 x²(x²+5- 10x)