问题
解答题
因式分
①x3-25x
②x2-6xy+9y2-1.
答案
①原式=x(x2-25)
=x(x+5)(x-5);
②原式=(x2-6xy+9y2)-1
=(x-3y)2-1
=(x-3y+1)(x-3y-1).
因式分
①x3-25x
②x2-6xy+9y2-1.
①原式=x(x2-25)
=x(x+5)(x-5);
②原式=(x2-6xy+9y2)-1
=(x-3y)2-1
=(x-3y+1)(x-3y-1).