(x+1)(x+2)/1+(x+2)(x+3)/1约分谢谢

分类: 作业答案 • 2022-03-12 10:09:28

问题描述：

答

(x+1)(x+2)/1+(x+2)(x+3)/1
应该是：1/[(x+1)(x+2)]+1/[(x+2)(x+3)]
=1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)
=1/(x+1)-1/(x+3)
=2/[(x+1)(x+3)]
1是分子,（X+1）（X+2）是分母.