Question

Даю 99 БАЛЛОВ !!!!(√(10) − √(80) + √(45)) × (0,5 × √(40) + 0,5 × √(20))

Answer 1

$(sqrt{10} - sqrt{80} + sqrt{45}) * (0,5 * sqrt{40} +0,5 * sqrt{20} ) = \ = (sqrt{10} - sqrt{80} + sqrt{45}) * ( sqrt{10} + sqrt{5} ) = \ sqrt{10*10} - sqrt{10*80} + sqrt{45*10} + sqrt{10*5} - sqrt{80*5} + sqrt{45*5} = \ = sqrt{100} - sqrt{800} + sqrt{450} + sqrt{50} - sqrt{400} + sqrt{225} = \ =10 - 20 sqrt{2} +3 sqrt{50} + sqrt{50} -20 + 15 = \ = 5 - 20 sqrt{2} +4 sqrt{50} = 5 - 20 sqrt{2} +20 sqrt{2} = 5$

Ответ: $5$

Answer 2

Да

Answer 3

лови