(1)(-y的平方+x)(x+y的平方)
=x²-y的4次方
(2)x(x+5)-(x-3)(x+3)
=x²+5x-x²+9
=5x+9
(3)(3x-y)(-y+3x)
=(3x-y)²
=9x²-6xy+y²
(4)4x(x-1)的平方+x(2x+5)(5-2x)
=4x³-8x²+4x+25x-4x³
=-8x²+29x
如果本题有什么不明白可以追问,
(1)(-y的平方+x)(x+y的平方)
=x²-y的4次方
(2)x(x+5)-(x-3)(x+3)
=x²+5x-x²+9
=5x+9
(3)(3x-y)(-y+3x)
=(3x-y)²
=9x²-6xy+y²
(4)4x(x-1)的平方+x(2x+5)(5-2x)
=4x³-8x²+4x+25x-4x³
=-8x²+29x
如果本题有什么不明白可以追问,