Ответы на вопрос:
17/28+х=-1ц1/7+5/7 х=-17/28-1ц1/7+5/7 х= -17/28-1ц4/28+20/28 х=-1ц21/28+20/28 х=-1ц1/28 проверка 17/28+(-1ц1/28)= - 1ц1/7+5/7 17/28-1ц1/28= - 8/7+5/7 17/28-29/28= - 3/7 -12/28= - 3/7 -3/7= - 3/7
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