Explicație pas cu pas:
a)
[tex]{3}^{77} + {3}^{75} - {10}^{26} = {3}^{2} \times {3}^{75} + {3}^{75} - {10}^{26}= {3}^{75}( {3}^{2} + 1) - {10}^{26} = {3}^{75}(9 + 1) - {10}^{26} = 10 \times {3}^{75} - 10 \times {10}^{25} = 10( {3}^{75} - {10}^{25} )[/tex]
b)
[tex] \frac{{3}^{77} + {3}^{75} - {10}^{26}}{x} = \frac{{3}^{75} - {10}^{25}}{0.4} \\ \frac{10( {3}^{75} - {10}^{25} )}{x} = \frac{{3}^{75} - {10}^{25}}{0.4} \\ \frac{10}{x} = \frac{1}{0.4} \\ x = 0.4 \times 10 \\ x = 4[/tex]
