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= (48:8). x^6:x^5 . y^5:y^4
= 6.x.y
= 6xy
2) (n+4)² = n²+2.n.4+4²
= n²+8n+16
3) diket : m = 3 , n = -5 maka:
m²-2mn+n² = 3²-2.3 (-5)+(-5)²
= 9+30+25
= 64