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Tohaina

\left(10+xy\right)\left(10-xy\right)
Tuhia anō te 100-x^{2}y^{2} hei 10^{2}-\left(-xy\right)^{2}. Ka taea te rerekētanga o ngā pūrua te whakatauwehe mā te ture: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).
\left(xy+10\right)\left(-xy+10\right)
Whakaraupapatia anō ngā kīanga tau.