1. Let

$$
S=\frac{1}{2}, E=\frac{\frac{3}{7}+1}{\frac{3}{7}-1}, D=-2: \frac{5}{3}+1.1, A=3-0.2 \cdot 2, M=100 \cdot 0.03-5.25: \frac{1}{2}
$$

Calculate the value of the expression $S+E: D-A \cdot M$.
First solution.

$E=\frac{\frac{3}{7}+1}{\frac{3}{7}-1}=\frac{\frac{10}{7}}{\frac{-4}{7}}=\frac{-5}{2}=-2.5$

1 POINT

$D=-2: \frac{5}{3}+1.1=-2 \cdot \frac{3}{5}+1.1=-\frac{6}{5}+1.1=-1.2+1.1=-0.1 \quad$ 1 POINT

$A=3-0.2 \cdot 2=3-0.4=2.6$

$M=100 \cdot 0.03-5.25: \frac{1}{2}=3-5.25 \cdot 2=3-10.5=-7.5$

The value of the expression $S+E: D-A \cdot M$ is

$0.5+(-2.5):(-0.1)-2.6 \cdot(-7.5)=0.5+25+19.5$