Предмет: Математика, автор: natalime55

помогите срочно друзья

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Автор ответа: VlasovDanil59

(50-30)-20=0 50-(30-20)=40 12-(6-6) =12 (12-6)-6=0 (9+9)-5=13 11-(5-3)=9

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