问题
解答题
因式分
(1)x(x+y)-y(x+y)
(2)3x2-18x+27.
答案
(1)x(x+y)-y(x+y)=(x+y)(x-y);
(2)3x2-18x+27=3(x2-6x+9)=3(x-3)2.
因式分
(1)x(x+y)-y(x+y)
(2)3x2-18x+27.
(1)x(x+y)-y(x+y)=(x+y)(x-y);
(2)3x2-18x+27=3(x2-6x+9)=3(x-3)2.