1)X3-8y3 =(x-2y)(x²+2xy+4y²)2)–x2 -2xy-4y2 =-(x2 +2xy+4y2 )此题若是4xy能分解,是2xy不能分解–x2 -4xy-4y2 =-(x2 +4xy+4y2 )=-(x+2y)²3）x3+4xy+4y2-2x-4y+1 此题也有错误,若是x²能分解,是...