数学啊数学
3个回答
展开全部
原式可化为=1/(X-2)*(X-1)+1/X(X-1)+1/X(X+1)+1/(X+1)(X+2)
1 2 项通分 3 4项通分得 =X+(X-2)/X(X-1)(X-2)+X+(2+X)/X(X+1)(X+2)
=2X-2/X(X-1)(X-2)+2X+2/X(X+1)(X+2)
=2(X-1)/X(X-1)(X-2)+2(X+1)/X(X+1)(X+2)
=2/X(X-2)+2/X(X+2)
通分得=2(X+2)+2(X-2)/X(X+2)(X-2)
=4X/X(X+2)(X-2)
=4/(X+2)(X-2)
1 2 项通分 3 4项通分得 =X+(X-2)/X(X-1)(X-2)+X+(2+X)/X(X+1)(X+2)
=2X-2/X(X-1)(X-2)+2X+2/X(X+1)(X+2)
=2(X-1)/X(X-1)(X-2)+2(X+1)/X(X+1)(X+2)
=2/X(X-2)+2/X(X+2)
通分得=2(X+2)+2(X-2)/X(X+2)(X-2)
=4X/X(X+2)(X-2)
=4/(X+2)(X-2)
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询