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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=4a²(2a-1)-4(2a+1)
e)-3k-6k³-18klm=-3k(1+2k²-6lm)
f)-0,25x-0,75y-1,5=-0,25(x+3y+6)
h)10x⁴+50x²-100x³= 10x²(x²+5-10x)