[tex]a) \ \boxed{11+x} = 11 + (-1) = 11 - 1 = 10\\\\\\b) \ \boxed{9-x} = 9-(-1) = 9+1 = 10\\\\\\c) \ \boxed{\frac{60}{-6\cdot x}} = \frac{60}{-6\cdot(-1)} = \frac{60}{6} = 10[/tex]
[tex]d) \ \boxed{ -\frac{2x}{0,2}}=\frac{-2\cdot(-1)}{0,2} = \frac{2}{0,2} = 10[/tex]
[tex]e) \ \boxed{x^{2}-9x} = (-1)^{2}-9\cdot(-1) = 1+9 = 10[/tex]
[tex]f) \ \boxed{\frac{2+x^{2}}{0,3}} =\frac{2+(-1)^{2}}{0,3} = \frac{2+1}{0,3} = \frac{3}{0,3} = 10[/tex]
