①a-1分之a -a-1（写过程）② x-3分之1-x-9分之6-6-2x分之x-1（写过程）
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a/(a-1) - a - 1 = a/(a-1) - (a+1) = a/(a-1) - (a+1)(a-1)/(a-1) = a/(a-1) - (a-1)/(a-1) = [ a - (a-1)]/(a-1) = 1/(a-1) 1/(x-3) - 6/(x-9) - (x-1)/(6-2x) = (x+3)/[(x+3)(x-3)] - 6/[(x+3)(x-3)] + (x-1)(x+3)/[2(x+3)(x-3)] = [ x+3 - 6 + (x-1)(x+3) ] / [(x+3)(x-3)] = (x-3+x+2x-3) / [(x+3)(x-3)] = (x+3x-6)/[(x+3)(x-3)]
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