Подставляем значение а:
(3(-1/9)-7)^2-10(2(-1/9)+5)(3(-1/9)-7)-10(2(-1/9)+5) =
(-3/9-7)^2-10(-2/9+5)(-3/9-7)-10(-2/9+5) =
(-30/9)^2-10(-2/9+5)(-30/9)-10(-2/9+5) =
(-10)^2-10(-2/9+5)(-10)-10(-2/9+5) =
100-10(-2/9+5)(-10)-10(-2/9+5) =
100-10(-2/9+45)(-10)-10(-2/9+5) =
100-10(-2/910+4510)-10(-2/9+5) =
100-10(-20/9+450)-10(-2/9+5) =
100-10(-20/9+45*10)-10(-2/9+5) =
100-10(450-20/9)-10(-2/9+5) =
100-10(405/9-20/9)-10(-2/9+5) =
100-10(385/9)-10(-2/9+5) =
100-385/3+10(-2/9+5) =
100-385/3+10(-2/9+45/9) =
100-385/3+10(43/9) =
100-385/3+430/9 =
900-1283+430/9 =
(9009-12833+430)/9 =
(8100-3849+430)/9 =
(8100-3419)/9 =
4681/9 =
519,8888888889.
Подставляем значение а:
(3(-1/9)-7)^2-10(2(-1/9)+5)(3(-1/9)-7)-10(2(-1/9)+5) =
(-3/9-7)^2-10(-2/9+5)(-3/9-7)-10(-2/9+5) =
(-3/9-7)^2-10(-2/9+5)(-3/9-7)-10(-2/9+5) =
(-30/9)^2-10(-2/9+5)(-30/9)-10(-2/9+5) =
(-10)^2-10(-2/9+5)(-10)-10(-2/9+5) =
100-10(-2/9+5)(-10)-10(-2/9+5) =
100-10(-2/9+45)(-10)-10(-2/9+5) =
100-10(-2/910+4510)-10(-2/9+5) =
100-10(-20/9+450)-10(-2/9+5) =
100-10(-20/9+45*10)-10(-2/9+5) =
100-10(-20/9+45*10)-10(-2/9+5) =
100-10(-20/9+450)-10(-2/9+5) =
100-10(450-20/9)-10(-2/9+5) =
100-10(405/9-20/9)-10(-2/9+5) =
100-10(385/9)-10(-2/9+5) =
100-385/3+10(-2/9+5) =
100-385/3+10(-2/9+45/9) =
100-385/3+10(43/9) =
100-385/3+430/9 =
900-1283+430/9 =
(9009-12833+430)/9 =
(8100-3849+430)/9 =
(8100-3419)/9 =
4681/9 =
519,8888888889.