1.
9/38+5/19;
14/65+1/15;
2 4/21+ 1 9/14;
2.
8 8/15- 4 19/30
7-4 11/18
6 5/12- 1 3/8
3.
x+( 4 2/7- 3 5/14)=3 1/6
4.
скорость катера по течению реки равна 16 3/9 км/ч; скорость течения реки
5.
12 /5/21-8-1 5/6
31-9 16/45-5/9
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