c. 11 3per4 - 3 1per3 : 1 1per3 × 2per3 + 1 7per12=
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[tex] \tt11 \frac{3}{4} - 3 \frac{1}{3} \div 1 \frac{1}{3} \times \frac{2}{3} + 1 \frac{7}{12} [/tex]
[tex] \tt = \frac{47}{4} - (\frac{10}{3} \div \frac{4}{3} )\times \frac{2}{3} + \frac{19}{12} [/tex]
[tex] \tt = \frac{47}{4} - (\frac{10}{3} \times \frac{3}{4} )\times \frac{2}{3} + \frac{19}{12}[/tex]
[tex] \tt = \frac{47}{4} - ( \frac{30}{12} \times \frac{2}{3}) + \frac{19}{12}[/tex]
[tex] \tt = \frac{47}{4} - ( \frac{15}{6} \times \frac{2}{3}) + \frac{19}{12}[/tex]
[tex] \tt = \frac{47}{4} - \frac{30}{18} + \frac{19}{12}[/tex]
[tex] \tt = \frac{47}{4} - \frac{15}{9} + \frac{19}{12} [/tex]
[tex] \tt = \frac{1.269}{108} - \frac{180}{108} + \frac{171}{108} [/tex]
[tex] \tt = \frac{1.260}{108} [/tex]
[tex] \tt = 11 \frac{72}{108}[/tex]
[tex] \tt = 11\frac{4}{6}[/tex]
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