Предмет: Математика, автор: ryenasssss

Числа p,q и r таковы, что pq<0, qr>0. Определите, может ли произведение чисел p и r быть равным:
1) -46 2) 0 3)8 4/13

Срочноооо!! Даю 40 баллов!!!!!!

Ответы

Автор ответа: mmb1
0

qr > 0

значит r и q одного знака (или положительные или отрицательные)

pq < 0

значит p противоположного знака с r и

и ни одно из них не равно 0 так как неравенства строгие

1. если r,q > 0 то p< 0

pr < 0

Значит может быть только отрицательным -46

2. если r,q < 0 то p>0

pr < 0

Значит опять только значение -46 может быть

Ответ только значение -46 (1)  

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заранее большое спасибо )