Question

Срочно !! 20 баллов !! 1) 8 1/15 - у =3 7/15() 2)х- 3 4/7 =2 5/7 ()3) (4 8/21 + z) - 7 13/21 = 2 12/21

Answer 1

$1);8frac1{15}-y=3frac7{15}\y=8frac1{15}-3frac7{15}=4frac9{15}=4frac35\\2);x-3frac47=2frac57\x=2frac57+3frac47=6frac27\\3);left(4frac8{21}+zright)-7frac{13}{21}=2frac{12}{21}\4frac8{21}+z=2frac{12}{21}+7frac{13}{21}\4frac8{21}+z=10frac4{21}\z=10frac4{21}-4frac8{21}=5frac{17}{21}$