Question

求10道因式分解的题，要有过程

Answer 1

19 x(x + 2)(2x - 1) 20 (y - 1)(y + 1)(y^2 - 8) 21 21 x^2[x-( 1 - 3^(1/2)/3)][x-(3^(1/2)/3 + 1)] 22 [x-( 1/3 - 7^(1/2)/3)][x-(7^(1/2)/3 + 1/3)] 23 {a-( b - (14^(1/2)*b)/2)}{a-(b + (14^(1/2)*b)/2)} 24 {x-((2*y)/3 - (34^(1/2)*y)/3)}{x-((2*y)/3 + (34^(1/2)*y)/3)} 25 {x-(- 6^(1/2)/2 - 3/2)}{x-(6^(1/2)/2 - 3/2)}