8/13м+5/26м+7/39м=48/78м+15/78м+14/78м=77/78м
39/16у+65/20у+11/8у=39/16у+13/4у+11/8у=39/16у+52/16у+22/16у=113/16у=7 целых 1/16у
<span>2 ц.4\11-1 ц.4\11=26/11-15/11=11/11=1
</span>
<span><span>3ц.3\12+111\12=39/12+111/12=150/12=12целых6/12</span>
</span>