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SecretMAMS
@SecretMAMS
July 2022
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Упростите выражения
9x^2-(5x-1)(2x+3)
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stasya20032
9x•2-(5x-1)(2x+3)
1)(5x-1)(2x+3)=5x•(2x+3)-1•(2x+3)=10x2+15x-2x-3=10x2+13x-3
2) 9x•2=18x
3) 18x-(10x2+13x-3)=18x-10x2-13x+3=5x-10x2+3
1 votes
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SecretMAMS
Почему в конце +3
stasya20032
Перед скобкой был -, значит после неё + меняются на - и наоборот
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Answers & Comments
1)(5x-1)(2x+3)=5x•(2x+3)-1•(2x+3)=10x2+15x-2x-3=10x2+13x-3
2) 9x•2=18x
3) 18x-(10x2+13x-3)=18x-10x2-13x+3=5x-10x2+3