решите уравнения (2,5-8c)^2-(8c-1,5)*(8c+1,5)=0

(2,5-8c)²-(8c-1,5)×(8c+1,5)=02,5²-2×2,5×8c+(8c)²-((8c)²-(1,5)²)=06,25-40c+64c²-(64c²-2,25)=06,25-40c+64c²-64c²+2,25=08,5-40c=0-40c=-8,5|÷(-40)c=(-8,5)/(-40)c=0,2125.Проверка:(2,5-8×0,2125)²-(8×0,2125-1,5)×(8×0,2125+1,5)=0(2,5-1,7)²-(1,7-1,5)×(1,7+1,5)=00,8²-0,2×3,2=00,64-0,64=00=0-истина.