1.6(6.4² -3.6²) /0.4(2.4² -0.4²)=1.6(6.4-3.6)(6.4+3.6)
/ 0.4(2.4-0.4)(2.4+0.4) = 1.6(2.8*10) /0.4(2*2.8) = 4*10 /2 =2*10 =20
Положим х =-sqrt(17)
(x-x1)*(x-x2)*(x-x3)=(x^2-x*(x1+x2)+x1*x2)*(x-x3)=x^3-x^2*(x1+x2)+x*x1*x2-x3*x^2+x3**x*(x1+x2)-x1*x2*x3=x^3-x^2(x1+x2+x3)+x*(x1*x2+x3*x1+x3*x2)-x1*x2*x3
M=-2*sqrt(17)
sqrt(17)*M=-34
Ответ: -34
2+8х=3х+9
8х-3х=9-2
5х=7
х=1,4
Ответ:х=1,4