x(y-1) - y(x+1) при x = 1, y = -2/1(-2/3 - 1) - (-2/3)(1 + 1-2/3 - 1 + 4/-3/3 + 4/1/3
x(y-1) - y(x+1) при x = -1/5, y = -0,-1/5(-0.6 - 1) - (-0.6)(-1/5 + 11/5 -1.6 - (-0.6) 4/-0.32 + 0.2-0.08
c(b+c) - b(a-c) + c(b-c) + ab при b = 0.3, c = -1/-1/9(0.3 + -1/9) - 0.3(0-(-1/9)) + -1/9(0.3 - (-1/9)) + 0.3 -1/-1/9 0.0111 - 0.3 0.0333 - 1/9 0.0333 - 0.0-0.001 - 0.009999 - 0.003333 - 0.0-0.0443329
c(b+c) - b(a-c) + c(b-c) + ab при b = -0.25, c = -2/1-2/15(-0.25 + -2/15) - -0.25(0-(-2/15)) + -2/15(-0.25 - (-2/15)) + -0.25 -2/1-2/15 -0.1 + 0.25 0.133 - 2/15 (-0.2333) + 0.00.00266667 + 0.03325 + 0.0155556 + 0.00.10147267
Итак, ответы1) При x = 1, y = -2/3: 1/2) При x = -1/5, y = -0.6: -0.03) При b = 0.3, c = -1/9: -0.0443324) При b = -0.25, c = -2/15: 0.10147267
x(y-1) - y(x+1) при x = 1, y = -2/
1(-2/3 - 1) - (-2/3)(1 + 1
-2/3 - 1 + 4/
-3/3 + 4/
1/3
x(y-1) - y(x+1) при x = -1/5, y = -0,
Подставим значения переменных во второе выражение:-1/5(-0.6 - 1) - (-0.6)(-1/5 + 1
1/5 -1.6 - (-0.6) 4/
-0.32 + 0.2
-0.08
c(b+c) - b(a-c) + c(b-c) + ab при b = 0.3, c = -1/
-1/9(0.3 + -1/9) - 0.3(0-(-1/9)) + -1/9(0.3 - (-1/9)) + 0.3 -1/
-1/9 0.0111 - 0.3 0.0333 - 1/9 0.0333 - 0.0
-0.001 - 0.009999 - 0.003333 - 0.0
-0.0443329
c(b+c) - b(a-c) + c(b-c) + ab при b = -0.25, c = -2/1
-2/15(-0.25 + -2/15) - -0.25(0-(-2/15)) + -2/15(-0.25 - (-2/15)) + -0.25 -2/1
-2/15 -0.1 + 0.25 0.133 - 2/15 (-0.2333) + 0.0
0.00266667 + 0.03325 + 0.0155556 + 0.0
0.10147267
Итак, ответы
1) При x = 1, y = -2/3: 1/
2) При x = -1/5, y = -0.6: -0.0
3) При b = 0.3, c = -1/9: -0.044332
4) При b = -0.25, c = -2/15: 0.10147267