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Verified answer
P = 7/6q = 1 1/2 = 3/2
r = 3/4
Maka
(p - q)² - (q - r)² = (7/6 - 3/2)² - (3/2 - 3/4)²
= (7/6 - 9/6)² - (6/4 - 3/4)²
= (-2/6)² - (3/4)²
= 4/36 - 9/16 → samakan penyebutnya
= 16/144 - 81/144
= -65/144