Ответы на вопрос:
1) r^3*s^3 * ( s + r) 2) 5a^3*x*( 4 - 3ax) 3) (x - 3)*(x + 3) 4) ( 1 - 5y)*(1 + 5y) 5) (3x - 2x^2) + ( 3y - 2xy) = x*(3 - 2x) + y*(3 - 2x) = ( 3 - 2x ) * ( x + y ) 6) (20z^2k - 5k) + (2z + 1) = 5k*(4z^2 - 1) + (2z + 1) = 5k*(2z - 1)*(2z + 1) + + (2z + 1) = (2z + 1)*(2z +1)*(2z - 1)*5k 7) 16t^2 + s^2*(8t + s^2) = 2*(8t + s^2)*(8t + s^2) 8) b^4 - 16c*(b^2 + 4c) = (b^2 - 4c)*(b^2 + 4c)
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