[tex]a)\ \ \frac{2a-b^2}{4}\ \ \ \ dla\ \ a=5\ \ i\ \ b=-3\\\\\frac{2a-b^2}{4}=\frac{2\cdot5-(-3)^2}{4}=\frac{10-9}{4}=\frac{1}{4}\\\\\\b)\ \ 3,5x+5y\ \ \ \ dla\ \ x=-5\ \ i\ \ y=2\\\\3,5x+5y=3,5\cdot(-5)+5\cdot2=-17,5+10=-7,5\\\\\\c)\ \ 3x-\frac{1}{2}y\ \ \ \ dla\ \ x=6\ \ i\ \ y=-4\\\\3x-\frac{1}{2}y=3\cdot6-\frac{1}{\not2_{1}}\cdot(-\not4^2)=18+2=20[/tex]
[tex]d)\ \ \frac{4}{t+3s}\ \ \ \ dla\ \ t=-3\ \ i\ \ s=-2\\\\\frac{4}{t+3s}=\frac{4}{-3+3\cdot(-2)}=\frac{4}{-3-6}=\frac{4}{-9}=-\frac{4}{9}\\\\\\e)\ \ 3mn+m^2n\ \ \ \ dla\ \ m=2\ \ i\ \ n=-6\\\\3mn+m^2n=3\cdot2\cdot(-6)+2^2\cdot(-6)=-36+4\cdot(-6)=-36-24=-60[/tex]
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[tex]a)\ \ \frac{2a-b^2}{4}\ \ \ \ dla\ \ a=5\ \ i\ \ b=-3\\\\\frac{2a-b^2}{4}=\frac{2\cdot5-(-3)^2}{4}=\frac{10-9}{4}=\frac{1}{4}\\\\\\b)\ \ 3,5x+5y\ \ \ \ dla\ \ x=-5\ \ i\ \ y=2\\\\3,5x+5y=3,5\cdot(-5)+5\cdot2=-17,5+10=-7,5\\\\\\c)\ \ 3x-\frac{1}{2}y\ \ \ \ dla\ \ x=6\ \ i\ \ y=-4\\\\3x-\frac{1}{2}y=3\cdot6-\frac{1}{\not2_{1}}\cdot(-\not4^2)=18+2=20[/tex]
[tex]d)\ \ \frac{4}{t+3s}\ \ \ \ dla\ \ t=-3\ \ i\ \ s=-2\\\\\frac{4}{t+3s}=\frac{4}{-3+3\cdot(-2)}=\frac{4}{-3-6}=\frac{4}{-9}=-\frac{4}{9}\\\\\\e)\ \ 3mn+m^2n\ \ \ \ dla\ \ m=2\ \ i\ \ n=-6\\\\3mn+m^2n=3\cdot2\cdot(-6)+2^2\cdot(-6)=-36+4\cdot(-6)=-36-24=-60[/tex]