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Problemi Simili mit-Tiftix tal-Web

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\left(2c-3d\right)\left(2c+3d\right)
Erġa' ikteb 4c^{2}-9d^{2} bħala \left(2c\right)^{2}-\left(3d\right)^{2}. Id-differenza tal-kwadrati tista' tiġi fatturata billi tuża r-regola: a^{2}-b^{2}=\left(a-b\right)\left(a+b\right).