[tex]a)1.7(2) + 1.72 + 17.2[/tex]
[tex] = 1 \frac{72 - 7}{90} + \frac{172}{100} + \frac{172}{10} [/tex]
[tex] = 1\frac{65}{90} + \frac{172}{100} + \frac{172}{10} [/tex]
[tex] = \frac{1 \times 90 + 65}{90} + \frac{172}{100} + \frac{172}{10} [/tex]
[tex] = \frac{90 + 65}{90} + \frac{172}{100} + \frac{172}{10} [/tex]
[tex] = \frac{155}{90} + \frac{172}{100} + \frac{172}{10} [/tex]
[tex] = \frac{1550}{900} + \frac{1548}{900} + \frac{15480}{900} [/tex]
[tex] = \frac{1550 + 1548 + 15480}{900} [/tex]
[tex] = \frac{18578}{900} [/tex]
[tex] = \frac{9289}{450} [/tex]
[tex]b)2.1 + 3.(15)[/tex]
[tex] = \frac{21}{10} + 3 \frac{15}{99} [/tex]
[tex] = \frac{21}{10} + \frac{3 \times 99 + 15}{99} [/tex]
[tex] = \frac{21}{10} + \frac{297 + 15}{99} [/tex]
[tex] = \frac{21}{10} + \frac{312}{99} [/tex]
[tex] = \frac{2079}{990} + \frac{3120}{990} [/tex]
[tex] = \frac{2079 + 3120}{990} [/tex]
[tex] = \frac{5199}{990} [/tex]
[tex] = \frac{1733}{330} [/tex]
