Question

алгебра 8 класс...............

Answer 1

С1. 1 и 2
$-(4 sqrt{3} -7)(4 sqrt{3} +7)=-(48-49)=1$
C2. Сначала 1 и 3 результат со 2
$7( frac{1}{ sqrt{2} +3} - frac{1}{1-2sqrt{2} } )=7* frac{2+3 sqrt{2} }{[tex]7( frac{2+3 sqrt{2}}{1+5sqrt{2}} + frac{2}{4+ sqrt{2}})=7* frac{24sqrt{2}+16}{21sqrt{2}+14} =8$} [/tex]