(1)(-3xy2)3?(
x3y)2,1 6
=-27x3y6?
x6y2,1 36
=-
x9y8;3 4
(2)4a2x2?(-
a4x3y3)÷(-2 5
a5xy2),1 2
=4a2x2?(-
)a4x3y3÷(-2 5
)a5xy2,1 2
=
ax4y;16 5
(3)(2x-y)(4x2-y2)(2x+y),
=(4x2-y2)(4x2-y2),
=(4x2-y)2,
=16x4-8x2y2+y4;
(4)x2?(x+2)(x?2)?(x+
)2,1 x
=x2-x2+4-x2-2-
,1 x2
=-x2+2-
.1 x2