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anton999anton
@anton999anton
July 2022
1
7
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Помоги
математика 8 класс...
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DChernoivanova
№1
9·(
)²-19
=9·
-19
=
-19
=-19
№2
4
№3
АБВ
321
№4
3
№5
(2-с)²-с(с+4)=4-4с+с²-с²-4с=4-8с
4-8·0,5=4-4=0
№7
х²-6х-16=0
D=(-6)²-4(-16)=36+64=100=10²
х₁=8
х₂=-2
1 votes
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Answers & Comments
9·()²-19=9·-19=-19=-19
№2
4
№3
АБВ
321
№4
3
№5
(2-с)²-с(с+4)=4-4с+с²-с²-4с=4-8с
4-8·0,5=4-4=0
№7
х²-6х-16=0
D=(-6)²-4(-16)=36+64=100=10²
х₁=8
х₂=-2