(x+1)(x+2)/1+(x+2)(x+3)/1 - 知识问答

(x+1)(x+2)/1+(x+2)(x+3)/1约分谢谢

2个回答

(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.

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