(13 целых 1\10 -12.05):7.2/0.48*11.7+(1.25*0.4+18.54 :1.8):(0.43+17.57)

1)
$13 \frac{1}{10} - 12.05= 1 \frac{10 - 5}{100} = 1 \frac{5}{100} = 1.05$
2)
$1.05 \div 7.2 = \frac{105 \times 10}{100 \times 72} = \frac{105}{2 \times 72} = \frac{21}{2 \times 72} = \frac{7}{2 \times 24} = \frac{7}{48}$
3)

$0.48 \times 11.7 = \frac{48 \times 117}{100 \times 10} = \frac{48 \times 117}{1000} = \frac{6 \times 117}{125} = \frac{702}{125} = 5 \frac{77}{125} = 5.616$
4)
$1.25 \times 0.4 = \frac{125 \times 4}{100 \times 10} = \frac{500}{1000} = \frac{1}{2} = 0.5$
5)
$18.54 \div 1.8 = \frac{1854 \times 10}{100 \times 18} = \frac{103}{10} = 10.3$
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