a)=35*(3/5)+35*(1/7)=21+5=26
2) 2ц3/14(4ц 6/9+1ц 5/9)=2ц 3/14*6ц 2/9=31/14*56/9=124/9=13ц7/9
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1/7=5/35
21/35+7/35=28/35
28/35=4/5
4/5*35=140/5
a)=35*(3/5)+35*(1/7)=21+5=26
2) 2ц3/14(4ц 6/9+1ц 5/9)=2ц 3/14*6ц 2/9=31/14*56/9=124/9=13ц7/9