Предмет: Алгебра, автор: Кристина15551

Сумма, разность и произведение чисел А и B относится как 5:1:18. Чему равен среднее арифметическое чисел A и B?

Ответы

Автор ответа: ShirokovP

6

Система:

х + у = 5(х - у) ;

х*у = 18(х - у)

х = 9;
у = 6.

Sa = ( 9 +6)/2 = 7,5

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