√578&559:114Вот так решай на здоровье
^ знак степени ; ^3 в третьей
(3,5*1 2\3 - 6,75) * (1 1\3) 3 степень
=
{35/10• (3•1+2)/3 - 6,75}• (1 1/3)^3=
Сокращаем 35/10 на 5;
{ 7/2• 5/3 - 675/100}• ( 1•3+1/3)^3=
Сокращаем 675/100 на 25
{ 35/6 - 27/4} • (4/3)^3=
{ (35•2)/(6•2)- (27•3)/(4•3)} • (4/3)^3=
{ 70/12- 81/12} • (4/3)^3=
{ -( 81/12- 70/12)} • (4•4•4)/(3•3•3)=
{- 11/12}• (4•4•4)/(3•3•3)=
Сокращаем 12 и 4 на 4;
{ -11/3}• (1•4•4)/(3•3•3)=
(-11• 4•4)/(3•3•3•3)=
(-44•4)/(9•9)=
(-176)/(81)=
(-2 14/81).
4.7y-2.5y-12.4=1.9
2.2y-12.4=1.9
2.2y=1.9+12.4
2.2y=14.3
y=6.5