1/2+6 3/7=? 6+4 9/11=? 2/9+1 8/15=? 1/14+9 3/7=? 7 1/12+6=? 5/7+3 1/4 Помогите...

1/2+6 3/7= $\frac{1}{2} + \frac{45}{7}= \frac{7}{14} + \frac{90}{14}= \frac{97}{14} = 6\frac{13}{14}$
6+4 9/11= $10\frac{9}{11}$
2/9+1 8/15= $\frac{2}{9} + \frac{23}{15} =\frac{10}{45} + \frac{69}{45}= \frac{79}{45}= 1 \frac{34}{45}$
1/14+9 3/7= $\frac{1}{14} + \frac{66}{7} = \frac{1}{14} + \frac{132}{14} = \frac{133}{14}= 9 \frac{7}{14} =9 \frac{1}{2}$
7 1/12+6= $13\frac{1}{12}$
5/7+3 1/4= $\frac{5}{7}+ \frac{13}{4}= \frac{20}{28}+ \frac{91}{28} = \frac{111}{28} = 3 \frac{27}{28}$