1. Zadatak

Prvo rješenje.

$$E=\frac{\frac37+1}{\frac37-1}=\frac{\frac{10}{7}}{-\frac47}=-\frac52=-2.5$$ $$\begin{aligned} D&=-2:\frac53+1.1=-2\cdot\frac35+1.1\\ &=-\frac65+1.1=-1.2+1.1=-0.1 \end{aligned}$$ $$A=3-0.2\cdot2=3-0.4=2.6$$ $$\begin{aligned} M&=100\cdot0.03-5.25:\frac12\\ &=3-5.25\cdot2=3-10.5=-7.5 \end{aligned}$$

Vrijednost izraza $S+E:D-A\cdot M$ je

$$\begin{aligned} &0.5+(-2.5):(-0.1)-2.6\cdot(-7.5)\\ &=0.5+25+19.5 \end{aligned}$$ $$=45$$

Drugo rješenje.

Vrijednost izraza $S+E:D-A\cdot M$ je

$$\begin{aligned} &\frac12+\frac{\frac37+1}{\frac37-1}:\left(-2:\frac53+1.1\right)\\ &\quad-\left(3-0.2\cdot2\right)\cdot\left(100\cdot0.03-5.25:\frac12\right)\\ &=\frac12+\left(-\frac52\right):\left(-\frac1{10}\right)-\frac{26}{10}\cdot\left(-\frac{15}{2}\right)\\ &=\frac12+25+19\frac12\\ &=45 \end{aligned}$$