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(a - b)² = a² + b² - 2ab
jadi, jika :
a = 2m
b = 1/2 , maka
(2m - 1/2)²
= (2m)² + (1/2)² - 2(2m)(1/2)
= 4m² + 1/4 - 2m
Maka , jawabannya
= 4m² - 2m + 1/4