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2) (b+b²)=b(1+b)
3) (x²+x)=x(x+1)
4)(3a²-a²)=a²(3-1)
5)(x²-4x4)=x²(1-4x²)
6)(5m²+15m²)=5m²(1+3)
7)(ab-bc)=b(a-c)
8)(x²y+x²z)=x²(y+z)
9)(2a²x²-18ax²)=2ax²(a-9)
10)(8m²-12mn)=4m(2m-3n)
espero haberte ayudado :D