954. Найдите значения выражений: 18 31

1) а - 2,75 : b при а = 12,4; b = 4 5/7;

2) 1 2/3 = x+y: 19,5 при х = 3,6; у = 2 8/9

3)с:d: 0,96 – 0,35 при с = 1 1/33

4) 2 1/22 · z : t – 3,99 при z = 2 17/30; t = 1,3125​
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