Вычислите: a) 2:17/82; b) 68/91×13/17; c) 2 3/8×4; d) - 7/36:3 1/9; e) - 7/8+5; j) 17/87+2 3/29; g) 3 13/14-2 5/6; h) - 3/7-1 3/14.​
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