化简：1.X²-4/X²+4X+4÷(X-2)×(X+1)(X+2)/X-22.1/X(X+1)+1/(X+1_数学解答

化简：1.X²-4/X²+4X+4÷(X-2)×(X+1)(X+2)/X-2
2.1/X(X+1)+1/(X+1)(X+2)+1/(X+2)(X+3)
3.X-9Y/6XY²-X+3Y/9X²Y

人气：358 ℃　时间：2020-04-19 17:17:19

解答

1.=...
2.=1/x-1/(x+1)+1/(x+1)-1/(x+2)+1/(x+2)-1/(x+3)=1/x-1/(x+3)=3/x(x+3);
3.=(2Y-9)/6X²Y