Question

номер 821 )))))))))))))))))))

Answer 1

1)
$frac{3}{10} + frac{9}{10} = frac{3+9}{10} = frac{12}{10} =1,2$
2)
$1 frac{5}{10} +2 frac{3}{10} = frac{15}{10} + frac{23}{10} = frac{15+23}{10} = frac{38}{10} =3,8$
3)
$frac{23}{100} + frac{19}{100} = frac{23+19}{100} = frac{42}{100} =0,42$
4) 
$8 frac{91}{1000} + frac{985}{1000} = frac{8091}{1000} +frac{985}{1000}= frac{8091+985}{1000} = frac{9076}{1000} =9,076$
5)
$2 frac{11}{100} + frac{95}{100} = frac{211}{100} +frac{95}{100} = frac{211+95}{100} = frac{306}{100} =3,06$
6)
$frac{813}{1000} +1 frac{7}{1000} = frac{813}{1000}+ frac{1007}{1000} = frac{813+1007}{1000} = frac{1820}{1000} =1,82$