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= 100m^2 + (2×10m×3n) + 9n^2
= 100 m^2 + 60mn + 9n^2
= (10m)² - 2(10m)(3n) + (3n)²
= 100m² - 60mn + 9n²
Cukup ingat :
(a- b)² = a² - 2ab + b²