Mathematics
Senior High

この3問の解き方を教えて欲しいです。

2 2 ①(a+b+c) + (a+b+c} 2 -(a+b-c)² (-a+b+c) (a+b+c)+(b+c-a)² - (cta-b)² - (a+b-c)² 3)√2-√5+√√9 √2+√5+√7 2

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