化简:1.2x/x²-4-1/x-2 2.(1+1/x)÷x²-1/x

问题描述:

化简:1.2x/x²-4-1/x-2 2.(1+1/x)÷x²-1/x

1、通分:
原式=[2X-(X+2)]/(X+2)(X-2)
=(X-2)/(X+2)(X-2)
=1/(X+2).
2、(X+1)/X*X/(X+1)(X-1)
=1/(X-1).