七下数学分式的加减的几道题1.2/(a-1)+(a-1)/(1-a) 2.(n^2+m^2)/(mn)+(m-n)^2/(-mn) 3.先化简,再求值:(a-2b)/(a^2-b^2)-a/(b^2-a^2),其中a=-2,b=3.4.(a-2b)/(a-b)-3b/(a-b)-4b/(b-a) 5.(m^2-3)/(m-2)+1/(m-2)-(6-4m)/(2-m)6.当x=-2/3时,求6/(x^
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