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p=-4
q=2
r=5
pertanyaan
p2r-q2r=....
jawab(-4)(2.5)-(2.2).5=....
(-4)10-4.5=...
(-40)-20= -60
p²r = (-4)²5 = 16. 5 = 80
q²r = 2²5 = 4.5 = 20
p²r-q²r = 80-20 = 60
kalau itu bukan kuadrat maka
p2r = -4.2.5 = -40
q2r = 2.2.5 = 20
-40-20 = -60