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/2
x)3{0iGq~Q~Nųi;u-+t @.X1+ P}Fڕ@~7I*'hX!+WΆ|nuӟX|g

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?