найдите значения выражений: 1) (2/7+ 3 1/2) * 4 2/3;
2) (2 1/5 - 2 3/4)*2 2/19;
3) (5 6/7 + 3 5/21)*2 1/10;
4) (7 5/12 - 3 1/6)*2 2/17​
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