a)
-10*(-5)-15-15:53-(-8)=
50-15-33+8=
50-15-9+8= 58-24=34
b)
-5-2*(-5/6)= -5 +\frac{10}{6} = -5 +\frac{5}{3} = -5 +1$\frac{2}{3}$ =
-4$\frac{3}{3} +1\frac{2}{3} = - 3\frac{1}{3}$
c)
1/2x do potęgi 2 + 3x-1 dla x=1
\frac{1}{4} x^2 +3x-1=
\frac{1}{4} 1^2 +3*1-1=
\frac{1}{4} +3-1= 2$\frac{1}{4}$