问题标题：
【数学分式通分1/ac;1/2b[通分]1/x-1;4/x^2-1[通分]3/x-2;2/6-3x[通分]1/(x+1)(x-4);2/(x-4)^2[通分]】
问题描述：
数学分式通分
1/ac;1/2b[通分]
1/x-1;4/x^2-1[通分]
3/x-2;2/6-3x[通分]
1/(x+1)(x-4);2/(x-4)^2[通分]
陈希强回答：
1/ac;1/2b[通分]2b/2abc;ac/2abc
1/x-1;4/x^2-1[通分]x+1/(x+1)(x-1);4/(x+1)(x-1)
3/x-2;2/6-3x[通分]9/3(x-2);-2/3(x-2)
1/(x+1)(x-4);2/(x-4)^2[通分](x-4)/(x+1)(x-4)^2;2(x+1)/(x+1)(x-4)^2
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