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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

\left(a-b-2c\right)^{2}
Whakamahia te tikanga tātai pūrua pā, p^{2}+q^{2}+r^{2}+2pq+2pr+2qr=\left(p+q+r\right)^{2}, ina p=a, ina q=-b, ina r=-2c.