1. fatore as expressões:
a) 15x^7 - 3ax^4 =
b) x^7 + x^8 + x^9 =
c) a^5 + a^3 -a^2 =
d) 6^8 - 10x^2 +4x^4 =
e) 6x^2y + 12xy - 9xyz =
f) a ( x - 3 ) + b ( x - 3 ) =
g) 9 ( m+ n ) - a ( m + n ) =
h) 8x^6 - 12x^8 =
i) 15x^8 - 21x^2 =
j) 14x^2 + 42x =
k) x^2y + xy^2 =