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8. x^2 -5x-6/x+1=(×+1)(x-6)/(x+1)=x-6
9. 3x^2 -27/×^2 +2x-3=3(x-3)(x+3)/(x+3)(x-1)=3x-9/x-1
10. 2x^2 +3x-9/x^2 +2x-3=(2x-3)(x+3)/(x+3)(x-1)=2x-3/x-1
11. (2x+3)(x-4)/(x-4)(x+4)=2x+3/x+4
12. -(x-5)(x+7)/(x-5)(x+5)=-x-7/x+5
maaf ngerjainnya berantakan, semoga dapat membantu :)
9. 2x-9 per x-1
10. 2x-3 per x-1
11. 2x+3 per x+4
12. -x-7 per x-5