[tex] \frac{42 - 3 \times 4}{ {6}^{2} } = \\ = \frac{42 - 12}{6 \times 6 = 36 } \\ = \frac{30}{36} \\ \frac{5 {}^{2} - 1 }{ {6}^{2} + 3} \\ = \frac{5 \times 5 = 25 - 1 = 24}{6 \times 6 = 36 + 3 = 39} \\ \frac{6 {}^{2} - 3 {}^{2} }{ {8}^{2} - {1}^{2} } \\ = \frac{6 \times 6 = 36 - 3 \times 3 = 9 = 27}{8 \times 8 = 64 - 1 = 63} \\ \ \frac{ {10}^{2} - 6 \times 11 }{ {10}^{2} - {7}^{2} } \\ = \frac{10 \times 10 = 100 - 66 = 34}{10 \times 10 = 100 - 7 \times 7 = 49 = 51} [/tex]
Succes !!
