4(2x-y)^-9(x+3y)^^是平方
问题描述：
4(2x-y)^-9(x+3y)^
^是平方
答
7x^2+38xy+85y^2
答
【8x-4y+9x+27y][8x-4y-9x+27y]=[17x+23y][23y-x]=
答
4(2x-y)^-9(x+3y)^
=(4x-2y+3x+9y)(4x-2y-3x-9y)
=(7x+7y)(x-11y)
=7(x+y)(x-11y)
答
4(2x-y)^-9(x+3y)^
=(4x-2y)²-(3x+9y)²
=(4x-2y+3x+9y)(4x-2y-3x-9y)
=7(x+y)(x-11y)