Question

решите уровнения (5-x)^2-x(2,5+x)=0​

Answer 1

${(5 - x)}^{2} - x(2.5 + x) = 0 \\ 25 - 10x + {x}^{2} - 2.5x - {x}^{2} = 0 \\ 25 - 12.5x = 0 \\ - 12.5x = - 25 \\ x = 2$