因式分解八倍的x加y的三次方减27倍的x减y的三次方等于扫码下载作业帮搜索答疑一搜即得答案解析 查看更多优质解析8(x+y)^3-27(x-y)^3=[2(x+y)]^3-[3(x-y)]^3=[2(x+y)-3(x-y)]*{ [2(x+y)]^2 +2(x+y)*3(x-y) + [3(x-y)]^2 } （公式：a^3-b^3=(a-b)(a^2+ab+b^2) ）=(2x+2y-3x+3y)[4(x+y)^2+6(x+y)(x-y)+9(x-y)^2]=(5y-x)(4x^2+8xy+4y...解析看不懂？免费查看同类题视频解析查看解答更多答案(1)}