Ответ:
1) а+b-c+d
2)a-b+c-d
3)a-b+c+d
4)a-b-c-c+d+k
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Ответ:
1) а+b-c+d
2)a-b+c-d
3)a-b+c+d
4)a-b-c-c+d+k