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Ответ:

5.7 + 4.5 = 10.2
9.1 - 3.5 = 5.6
3.5 × 5.6 = 19.6
[tex]\displaystyle9.225:4.5=\frac{9,225}{4,5}=\frac{9225}{4500} =\frac{41*225}{20*225}=\frac{41}{20}=\frac{2*20+1}{20} =2.05[/tex]

[tex]5.7 + 4.5 = 10.2[/tex]

[tex]9.1 - 3.5 = 5.6[/tex]

[tex]3.5 \times 5.6 = 19.6[/tex]

[tex]9.225 \div 4.5 = \frac{369}{40} \div \frac{9}{2} = \frac{369}{40} \times \frac{2}{9} = \frac{41}{20} [/tex]

или

[tex]2.05[/tex]