4,5:(47,375-26 1/3-18·0,75)·24:0,88:17,81:1,37-23 2/3:1 5/6

$1)(26 \frac{1}{3} -18\cdot 0,75)=(26 \frac{1}{3} -13,5)= (26 \frac{1}{3} -13 \frac{1}{2} )= (26 \frac{2}{6} -13 \frac{3}{6} )= \\ \\ =(25\frac{8}{6} -13 \frac{3}{6} )= 12\frac{5}{6} \\ \\ 2)12\frac{5}{6} \cdot 24=\frac{77}{6} \cdot 24=77\cdot4=308 \\ \\ 3)308:0,88=350 \\ \\ 4)47,375-350=-302,625 \\ \\ 5)4,5:(-302,625)=- \frac{4500}{302625}=- \frac{4}{269}$

6)17,81:1,37=13

7)23 2/3:1 5/6=71/3:11/6=(71/3)·(6/11)=(71·2)/11=142/11

8)13-142/11=(143/11)-(142/11)=1/11

$9)-\frac{4}{269} : \frac{1}{11}= -\frac{4}{269} \cdot 11=-\frac{44}{269}$