Выберите верные утверждения .
А)Если а>0 и b>0,то а+ b < 0.
Б)Если а< 0 и b<0 ,то аb > 0.
В)Если а<0 и b<0 , то а/b <0.
Г)Если аb>0 то и а<0, и b<0.
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