Question

допоможіть будь ласка за 20 хвилин​ мені срочно

Answer 1

${x}^{2} - \frac{4}{5} = ( - 1) {}^{2} - \frac{4}{5} = 1 - \frac{4}{5} = \frac{1}{5} = 0.2$

${x}^{2} - \frac{4}{5} = ( \frac{2}{5} ) {}^{2} - \frac{4}{5} = \frac{4}{25} - \frac{4}{5} = \frac{4}{25} - \frac{20}{25} = - \frac{ 16}{25} = - 0.64$

$0.7 - y {}^{3} = 0.7 - {( - 1)}^{3} = 0.7 - ( - 1) = 0.7 + 1 = 1.7$

$0.7 - y {}^{3} = 0.7 - {0.2}^{3} = 0.7 - 0.008 = 0.692$