August 2022 2 6 Report

ПОМОГИТЕ очень очень срочно

1.разложите многочлен на множители

ac-bc+5a+5b

2.докажите тождество

2a(a+b-c)-2b(a-b-c)+2c(a-b+c)=2(a в квадрате+b в квадрате+с в квадрате)

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