18. Выполните действия. 3 1 7 7 4 a) 2 =÷1-x3- 5 c) 5 =÷2=x5 7 5 1 12 ÷ ÷ :1-x 4 6 3 b) 3 12 x1-÷ 4 7 15 4 ×12-:7. 8 2 11 c) 1-x3-÷-×2-÷ 1 2 415 17 5 12 59​
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