(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
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![(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=](/uploads/image/z/7042996-28-6.jpg?t=%EF%BC%88a2-3a%2B2%E9%99%A4%E4%BB%A51%EF%BC%89%2B%EF%BC%88a2-5a%2B6%E9%99%A4%E4%BB%A51%EF%BC%89%2B%EF%BC%88a2-7a%2B12%E9%99%A4%E4%BB%A51%EF%BC%89%3D)
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(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)=
(a2-3a+2除以1)+(a2-5a+6除以1)+(a2-7a+12除以1)
= (1/(a2-3a+2))+(1/(a2-5a+6))+(1/(a2-7a+12))
= 1/(a-2)(a-1)+1/(a-2)(a-3)+1/(a-3)(a-4)
=((a-4)(a-3)+(a-1)(a-4)+(a-1)(a-2))/((a-1)(a-2)(a-3)(a-4))
=(3a*a-15a+18)/((a-1)(a-2)(a-3)(a-4))
=(3*(a-2)(a-3))/((a-1)(a-2)(a-3)(a-4))
=3/((a-1)(a-4))