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mrjuck
@mrjuck
July 2022
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реши-те пожалуйста номера : 10 11 12 13
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ivshinay74
10) 15/(х-3) = 15/17
(х-3)*15 = 15*17
15х - 45 = 255
15х = 255+45
15х = 300
х = 20
11) (-х - 5)² = (х + 9)²
х² + 10х + 25 = х² + 18 + 81
х² - х² + 10х - 18х = 81 - 25
-8х = 56
х = -7
12) С³ - 49 С = С (С² - 49) = С (С-7) (С+7)
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Answers & Comments
(х-3)*15 = 15*17
15х - 45 = 255
15х = 255+45
15х = 300
х = 20
11) (-х - 5)² = (х + 9)²
х² + 10х + 25 = х² + 18 + 81
х² - х² + 10х - 18х = 81 - 25
-8х = 56
х = -7
12) С³ - 49 С = С (С² - 49) = С (С-7) (С+7)