(1)(?
a2bc)?(?3 2
ab2)22 3
=(?
a2bc)?(3 2
a2b4)4 9
=?
×3 2
a2+2b1+4c4 9
=?
a4b5c,2 3
(2)-2a(3a2-a+3)
=(-2a)?3a2+(-2a)?(-a)+(-2a)?3
=-6a3+2a2-6a,
(3)(x+3)(x-4)-(x-1)2
=(x2-4x+3x-12)-(x2-2x+1)
=x2-x-12-x2+2x-1
=x-13,
(4)(4a3-6a2+9a)÷(-2a)
=(4a3-6a2+9a)×(?
)1 2a
=4a3×(?
)-6a2×(?1 2a
)+9a×(?1 2a
)1 2a
=?2a2+3a?
,9 2
(5)[(x-2y)2+(x-2y)(x+2y)-2x(2x-y)]÷2x
=[(x2-4xy+4y2+(x2-4y2)-4x2+2xy)]×
1 2x
=(-2x2-2xy)×
1 2x
=-x-y.