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ntulyaewa2017
@ntulyaewa2017
June 2022
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[tex] x^{7}+ 9x^{6} - x^{2} - 9x
(a+b)^{2} +2a+2b[/tex]
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zinaidazina
1)
х⁷ + 9х⁶ - х² - 9х =
= (х⁷ + 9х⁶) - (х² + 9х) =
= х⁶(х+9) - х(х+9) =
= (х+9)(х⁶-х) =
= х(х⁵-1)(х+9)
Можно решить иначе:
х⁷ + 9х⁶ - х² - 9х =
= х(х⁶ + 9х⁵ - х - 9) =
= х((х⁶+9х⁵)-(х+9)) =
= х(х⁵(х+9)-1(х+9)) =
= х(х+9)(х⁵-1)
2)
(a+b)² + 2a + 2b =
= (a+b)² + 2(a + b) =
= (a+b)(a+b+2)
3 votes
Thanks 1
ntulyaewa2017
в 1 в ответе откуда х перед скобкой???
zinaidazina
х вынесли из второй скобки (х⁶-х) =х(х⁵-1)
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Answers & Comments
х⁷ + 9х⁶ - х² - 9х =
= (х⁷ + 9х⁶) - (х² + 9х) =
= х⁶(х+9) - х(х+9) =
= (х+9)(х⁶-х) =
= х(х⁵-1)(х+9)
Можно решить иначе:
х⁷ + 9х⁶ - х² - 9х =
= х(х⁶ + 9х⁵ - х - 9) =
= х((х⁶+9х⁵)-(х+9)) =
= х(х⁵(х+9)-1(х+9)) =
= х(х+9)(х⁵-1)
2)
(a+b)² + 2a + 2b =
= (a+b)² + 2(a + b) =
= (a+b)(a+b+2)