(17/21-6/7):5/42 =(17/21-18/21)*42/5=-1/21 *42/5=-2/5=-0,4
Ответ: -0,4
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(17/21-6/7):5/42 =(17/21-18/21)*42/5=-1/21 *42/5=-2/5=-0,4
Ответ: -0,4