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[Reward 10] Urgently seek to solve the problem of mathematics simplification in senior two.
8 Front:

(a2-4)/(a-2)=(a+2)(a-2)/(a-2)= a+2

back: 1/(a2+2a)= 1/a(a+2)

(a+2)* 1/(a(a+2)= 1/a

10, before (x-1-x)/(x-1) =-1/(x-1)

- 1/(x- 1)*(x2-x)=- 1/(x- 1)* x(x- 1)=-x

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