题目

❶ 5﹙x-2﹚²+a﹙2-x﹚
❷﹙x+y﹚³﹙x+y﹚²-﹙-x-y﹚

提问时间：2021-03-14

答案

❶ 5﹙x-2﹚²+a﹙2-x﹚=5(x-2)²-a(x-2)=(x-2)(5x-10-a)❷﹙x+y﹚³+﹙x+y﹚²-﹙-x-y﹚=(x+y)³+(x+y)²+(x+y)=(x+y)[(x+y)²+(x+y)+1]=(x+y)(x²+2xy+y²+x+y+1...