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b) -6k³-18klm= -6k·k²-3·6klm= -6k(k²+3lm)
c) 10x ⁴+50x²-100x³= 10x²·x²+5·10x²-10·10x²·x=10x²(x²+5-10x)=10x²(x²-10x+5)