(1) (x+y)(-x-y)(x+y)²
=-(x+y)(x+y)(x+y)²
=-(x+y)的4次方
(2) (-1/3x²y³)³
=-1/27x的6次方y的9次方
(3) 若x²+3x-2=0
x²+3x=2
2x³+6x²-4x+2
=2x(x²+3x)-4x+2
=2x*2-4x+2
=2
(1) (x+y)(-x-y)(x+y)²
=-(x+y)(x+y)(x+y)²
=-(x+y)的4次方
(2) (-1/3x²y³)³
=-1/27x的6次方y的9次方
(3) 若x²+3x-2=0
x²+3x=2
2x³+6x²-4x+2
=2x(x²+3x)-4x+2
=2x*2-4x+2
=2