计算 (a²-3a+2分之2a-6 )-(a-1分之3)-(2-a分之2)
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计算 (a²-3a+2分之2a-6 )-(a-1分之3)-(2-a分之2)
((a²-3a+2分之2a-6)-(a-1分之3)-(2-a分之2)
=(2a-6)/(a²-3a+2)-3/(a-1)-2/(2-a)
=(2a-6)/[(a-1)(a-2)]-3/(a-1)+2/(a-2)
=(2a-6)/[(a-1)(a-2)]-3(a-2)/[(a-1)(a-2)]+2(a-1)/[(a-1)(a-2)]
=(2a-6-3a+6+2a-2)/[(a-1)(a-2)]
=(a-2)/[(a-1)(a-2)]
=1/(a-1)
=(2a-6)/(a²-3a+2)-3/(a-1)-2/(2-a)
=(2a-6)/[(a-1)(a-2)]-3/(a-1)+2/(a-2)
=(2a-6)/[(a-1)(a-2)]-3(a-2)/[(a-1)(a-2)]+2(a-1)/[(a-1)(a-2)]
=(2a-6-3a+6+2a-2)/[(a-1)(a-2)]
=(a-2)/[(a-1)(a-2)]
=1/(a-1)
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