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Автор - Kugo123

2 часть Д.З. подруги​
пожалуйста админы не удаляйте

Ответ

Проверено экспертом

Автор - NNNLLL54

3); ; -4cdot (x+2)+9x+27=-6\\-4x-8+9x+27=-6\\5x=-25; ; ,; ; x=-5\\\6cdot (y-8)-8y=4\\6y-48-8y=4\\-2y=52; ,; ; y=-26

4); ; 24cdot 17-54cdot 17+30cdot 27=17cdot (24-54)+30cdot 27=\\=-17cdot 30+30cdot 27=30cdot (-17+27)=30cdot 10=300\\\5); ; -2,268:4,05-1frac{5}{7}cdot 5frac{1}{4}-3,44=-0,56-frac{12}{7}cdot frac{21}{4}-3,44=\\=-4-3cdot 3=-4-9=-13

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