Question

алгебра (-/¯98 - -/¯8) * - /¯8

Answer 1

$(\sqrt{98} -\sqrt{8})*\sqrt{8} = \sqrt{98*8} -\sqrt{8*8} = \sqrt{49*2*8} -8=\sqrt{49*16} -8=\sqrt{49}*\sqrt{16}-8=7*4-8=28-8=20$

2 способ

$(\sqrt{98} -\sqrt{8})*\sqrt{8} =(\sqrt{49*2} -\sqrt{4*2})*\sqrt{8}= (7\sqrt{2}-2\sqrt{2})*\sqrt{8}=5\sqrt{2}*\sqrt{8}=5\sqrt{2*8}=5\sqrt{16}=5*4=20$

Answer 2

sqrt(98)=7*sqrt(20  sqrt(8)=2*sqrt(2)

14*2-8=20

Ответ: 20