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4r^{2}-24rt+36t^{2}
Utilitzeu el teorema del binomi \left(a-b\right)^{2}=a^{2}-2ab+b^{2} per desenvolupar \left(2r-6t\right)^{2}.
4r^{2}-24rt+36t^{2}
Utilitzeu el teorema del binomi \left(a-b\right)^{2}=a^{2}-2ab+b^{2} per desenvolupar \left(2r-6t\right)^{2}.