Olá
[tex]\LARGE\tt{} \dfrac{5}{43} - \dfrac{1}{3} \\ \\ \LARGE\tt{} \dfrac{5 \times 3}{43 \times 3} - \dfrac{1 \times 43}{3 \times 43} \\ \\ \LARGE\tt{} \dfrac{15}{129} - \dfrac{43}{129} \\ \\ \LARGE\tt{} \dfrac{15 - 43}{129} \\ \\ \LARGE\tt{} - (43 - 15) \\ \LARGE\tt{} - 28 \\ \\ \LARGE\tt{} \frac{ - 28}{129} \\ \\ {\large\boxed{\boxed{ { \LARGE \tt - \frac{28}{129} }}}}[/tex]
Então concluímos que:
[tex]{\large\boxed{\boxed{ { \LARGE \tt Alternativa \: A }}}}[/tex]
[tex]{\large\boxed{\boxed{ { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:\red{\heartsuit} }}}}[/tex]
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Olá
[tex]\LARGE\tt{} \dfrac{5}{43} - \dfrac{1}{3} \\ \\ \LARGE\tt{} \dfrac{5 \times 3}{43 \times 3} - \dfrac{1 \times 43}{3 \times 43} \\ \\ \LARGE\tt{} \dfrac{15}{129} - \dfrac{43}{129} \\ \\ \LARGE\tt{} \dfrac{15 - 43}{129} \\ \\ \LARGE\tt{} - (43 - 15) \\ \LARGE\tt{} - 28 \\ \\ \LARGE\tt{} \frac{ - 28}{129} \\ \\ {\large\boxed{\boxed{ { \LARGE \tt - \frac{28}{129} }}}}[/tex]
Então concluímos que:
[tex]{\large\boxed{\boxed{ { \LARGE \tt Alternativa \: A }}}}[/tex]
[tex]{\large\boxed{\boxed{ { \large \tt BONS \: \: ESTUDOS \: MEU \: ANJO \:\red{\heartsuit} }}}}[/tex]