Grupa I: 

$\underline{\left(-2,5\right)}\cdot \underline{\underline{\left(1,2\right)}}\cdot \underline{4}\cdot \underline{\underline{\left(-5\right)}}=\underline{\left(-2,5\right)\cdot 4}\cdot \underline{\underline{\left(1,2\right)\cdot \left(-5\right)}}=-10\cdot \left(-6\right)=60$  

Grupa II: 

$\underline{1,5}\cdot \underline{\underline{\left(-5\right)}}\cdot \underline{\left(-10\right)}\cdot \underline{\underline{\frac{1}{5}}}=\underline{1,5\cdot \left(-10\right)}\cdot \underline{\underline{\left(-5\right)\cdot \frac{1}{5}}}=-15\cdot \left(-1\right)=15$   

Grupa III: 

$37\cdot \underline{0,4}+\left(-35\right)\cdot \underline{0,4}=\underline{0,4}\cdot \left(37+\left(-35\right)\right)=0,4\cdot \left(37-35\right)=0,4\cdot 2=0,8$  

Grupa IV: 

$1,2\cdot \underline{\left(-5\right)}-\underline{\left(-5\right)}\cdot 1,3=\underline{\left(-5\right)}\cdot \left(1,2-1,3\right)=-5\cdot \left(-0,1\right)=0,5$