Предмет: Математика, автор: juliya2591

Номер 6 и 7, пожалуйста..

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Ответы

Автор ответа: Аноним

1

$6.\;x^2-6x-16=0\\D=36+4\cdot16=100\\x_{1,2}=\frac{6\pm10}2\\x_1=-2,\;x_2=8\\\\7.\;$

7. 1600-1440 = 160 руб

160:1600*100 = 0,1*100 = 10%

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