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hasil yang negatif jadi positif
|5-7| = |-2|= 7-5= 2
1.|-2| = 2 (c)
2.|x-1| =x-1
3. d
krn nilai akar 5 itu lebih kecil dari akar 7
4.krn n >= 2 maka |2-N| = N-2
5. |4-8N|=8n-4 =4(2N-1) (B)