$\underline{\text{obliczenia}}$

$2,4\cdot \left(2\frac{1}{4}+7,5\right)\cdot 0,1-8,8:1\frac{1}{10}=2\frac{4}{10}\cdot \left(2\frac{1}{4}+7\frac{1}{2}\right)\cdot \frac{1}{10}-8,8:1,1=$

$=2\frac{2}{5}\cdot \left(2\frac{1}{4}+7\frac{2}{4}\right)\cdot \frac{1}{10}-8=\frac{12}{5}\cdot 9\frac{3}{4}\cdot \frac{1}{10}-8=$

$=\frac{{\sout{12}}^3}{5}\cdot \frac{39}{{\sout{4}}^1}\cdot \frac{1}{10}-8=\frac{117}{50}-8=2\frac{17}{50}-8=2,34-8=-\left(8-2,34\right)=$

$=-\left(8-2-0,3-0,04\right)=-\left(6-0,3-0,04\right)=-5,66=-5\frac{66}{100}=-5\frac{33}{50}$

 

 

 

$7,35-\frac{7}{8}:2,8+2\frac{1}{4}=7,35-\frac{7}{8}:\frac{28}{10}+2\frac{1}{4}=7,35-\frac{{\sout{7}}^1}{8}\cdot \frac{10}{{\sout{28}}^4}+2,25=$

$=7,35-\frac{10}{32}+2,25=9,6-\frac{10}{32}=9,6-\frac{5}{16}=9,6-\frac{25}{80}=9,6-\frac{25\cdot 125}{80\cdot 125}=$

$=9,6-\frac{3125}{10000}=9,6-0,3125=9,2875=9\frac{2875}{10000}=9\frac{575}{2000}=9\frac{115}{400}=9\frac{23}{80}$

 

 

 

$\left[\left(32,8-7\frac{3}{4}\right):0,05+\frac{17}{20}\right]\cdot 0,01=\left[\left(32,8-7,75\right):0,05+0,85\right]\cdot 0,01=$

$=\left[25,05:0,05+0,85\right]\cdot 0,01=\left[2505:5+0,85\right]\cdot 0,01=$

$=\left[501+0,85\right]\cdot 0,01=501,85\cdot 0,01=5,0185=5\frac{185}{10000}=5\frac{37}{2000}$

 

 

$\frac{3}{4}\cdot \left(12,95\cdot \frac{12}{25}+0,35\right):0,5=0,75\cdot \left(12,95\cdot 0,48+0,35\right):0,5=$

$=0,75\cdot \left(6,216+0,35\right):0,5=0,75\cdot 6,566:0,5=4,9245:0,5=49,245:5=9,849=9\frac{849}{1000}$