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

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

Answer 2

sqrt(98)=7*sqrt(20  sqrt(8)=2*sqrt(2)

14*2-8=20

Ответ: 20