а) 3/5*70+1/7*70= 42+10= 52
б) 2 3/13*(5 5/9 - 1 5/9)= 2 3/13*4= 29/13*4= 116/13= 8 12/13
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а) 3/5*70+1/7*70= 42+10= 52
б) 2 3/13*(5 5/9 - 1 5/9)= 2 3/13*4= 29/13*4= 116/13= 8 12/13