分解因式:a(3x+9y)-x-3y1.分解因式:a(3x+9y)-x-3y2.已知:2m-n=3,4m+3n=1,求5n(2m-n)²-2（n-2m)³的值
问题描述：
分解因式:a(3x+9y)-x-3y
1.分解因式:a(3x+9y)-x-3y
2.已知:2m-n=3,4m+3n=1,求5n(2m-n)²-2（n-2m)³的值
答
a(3x+9y)-x-3y=3ax+9ay-x-3y=(3a-1)x+3y(3a-1)=(3a-1)(x+3y)
答
[3a(x+y)-x]/3x=y
答
:a(3x+9y)-x-3y=3a(x+3y)-(x+3y)=(3a-1))(x+3y)