Resposta :
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[tex]3 {}^{10} \div 3 {}^{7} - 4 {}^{1} x {}^{42} \\ 3 {}^{3} - 4 {}^{1} x {}^{42} \\ 3 {}^{3} - 4x {}^{42} \\ 27 - 4x {}^{42} [/tex]
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