因式分解 9x平方-18x-6y+3xy 5x平方+35xy+20x平方y
问题描述:
因式分解 9x平方-18x-6y+3xy 5x平方+35xy+20x平方y
9x平方-18x-6y+3xy 5x平方+35xy+20x平方y
答
9x^2-18x-6y+3xy
=9x(x-2y)+3xy-6y
=9x(x-2y)+3y(x-2y)
=3(x-2y)(3x+y)
5x^2+35xy+20x^2y
=5x(x+7y+4xy)