[tex]a)\\1\frac67+2\frac56=1\frac{36}{42}+2\frac{35}{42}=3\frac{71}{42}=4\frac{29}{42}\\\\b) \\4\frac38-2\frac15=4\frac{15}{40}-2\frac{8}{40}=2\frac7{40}\\\\c)\\7\frac29-3\frac25=7\frac{10}{45}-3\frac{18}{45}=6\frac{55}{45}-3\frac{18}{45}=3\frac{37}{45}\\\\d) \\\frac57*\frac{13}{15}=\frac17*\frac{13}3=\frac{13}{21}\\\\e)\\\frac38:\frac9{24}=\frac38*\frac{24}9=\frac{1}{1}*\frac{3}{3}=1*1=1\\\\f) \\2\frac37*10\frac12=\frac{17}7*\frac{22}2=\frac{374}{14}=26\frac{10}{14}=26\frac{5}7[/tex]
