Предмет: Химия, автор: elviranazarenko0

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2 задания на фото пожалуйста

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Автор ответа: YuryEuler
1

Ответ:

(x–3)²–6(x–3)+8=0

x–3=t

t²–6t+8=0

D = 36–32=4

t₁=(6+2)/2=4; t₂=(6–2)/2=2

x₁=4+3=7; x₂=2+3=5

————————————

(x–4)(2x+1)=3x(x–1)

x²+4x+4=0

D=16–16=0

x=–4/2=–2

P.S. На химию похоже маловато=)

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