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a)5a +10b -15c=5(a+2b-3c)
b)12x +5xy + 8x²=x(12+5y+8x)
c)5a² +15a +20a³=5a(a+3+4a^)
d)8a³-4a²-8a+4 =4(2a do 3-a^-2a+1)
e)-3k-6k³-18klm =-3k(1+2k^+6lm)
f)-0,25x-0,7a²+10abc =-1(0,25x+0,7a^-10abc)
g)5a+0,7a²+10abc=5a(1+2bc) +0,7a2
h)10x⁴+50x²-100x³ =10x (1 + 5x -10x^)
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