1.通分3x/x+1,2x+6/x,x方-9/x-12.通分x-1/1,-x方-1/1,x方+x/13.通分x-y/x,x方+2xy+y方/y,y方-x方/2

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1.通分3x/x+1,2x+6/x,x方-9/x-12.通分x-1/1,-x方-1/1,x方+x/13.通分x-y/x,x方+2xy+y方/y,y方-x方/21.通分3x/x+1,2x+6/x,x方-

1.通分3x/x+1,2x+6/x,x方-9/x-12.通分x-1/1,-x方-1/1,x方+x/13.通分x-y/x,x方+2xy+y方/y,y方-x方/2
1.通分3x/x+1,2x+6/x,x方-9/x-1
2.通分x-1/1,-x方-1/1,x方+x/1
3.通分x-y/x,x方+2xy+y方/y,y方-x方/2

1.通分3x/x+1,2x+6/x,x方-9/x-12.通分x-1/1,-x方-1/1,x方+x/13.通分x-y/x,x方+2xy+y方/y,y方-x方/2
计算是结果相加还是怎么的?