a²-4/a²-4a+3·a-3/a²+3a+2求解答这道初二数学题a²-4 a-3——— · ————a²-4a+3 a²+3a+2
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a²-4/a²-4a+3·a-3/a²+3a+2求解答这道初二数学题a²-4 a-3——— · ————a²-4a+3 a²+3a+2
a²-4/a²-4a+3·a-3/a²+3a+2求解答这道初二数学题
a²-4 a-3
——— · ————
a²-4a+3 a²+3a+2
a²-4/a²-4a+3·a-3/a²+3a+2求解答这道初二数学题a²-4 a-3——— · ————a²-4a+3 a²+3a+2
原式=(a+2)(a-2)(a-3)/(a-3)(a-1)(a+2)(a+1)=a-2/(a+1)(a-1)