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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

\left(\sqrt{7}\right)^{2}-2^{2}
Ka taea te whakareanga te panoni ki te rerekētanga o ngā pūrua mā te ture: \left(a-b\right)\left(a+b\right)=a^{2}-b^{2}.
7-2^{2}
Ko te pūrua o \sqrt{7} ko 7.
7-4
Tātaihia te 2 mā te pū o 2, kia riro ko 4.
3
Tangohia te 4 i te 7, ka 3.