更新时间2018-05-01 11:47:00
(3x+1)(2x-3)-2(x-1)(4x+1)
=6x²-9x+2x-3-2(4x²+x-4x-1)
=6x²-7x-3-2(4x²-3x-1)
=6x²-7x-3-8x²+6x+2
=-2x²-x-1
(3x+1)(2x-3)-2(x-1)(4x+1)
=6x²-7x-3-2(4x²-3x-1)
=6x²-7x-3-8x²+6x+2
=-2x²-x-1
解:原式=6x²-7x-3-8x²+6x+2
=-2x²-x-1
上一篇:菊酯类农药可以和波尔多液混用吗
下一篇:14905MB等于多少G?