Question

упростите выражение)))
1) √98 - 3.5√8 - 42 х √2 дробь 441.
2) (11-√в) х (11+√в) + (√в - 7)2 -170

Answer 1

$1) ...=sqrt{12.25*8}-3.5sqrt8-42sqrt{frac{2}{441}}=\ =3.5sqrt8-3.5sqrt8-42*frac{sqrt2}{21}=-2sqrt2\ \ 2)...=11^2-sqrt b^2+b-14sqrt b+49-170=121-b-14sqrt b-121=\=-(b+14sqrt b)$