Question

помогите пожалуйста ‍♂️‍♂️срочно!!
1) 15 1/5+ 19 4/5= 2) 35 7/9+ 12 2/3= 3) 28 3/12× 24=

Answer 1

$15 \frac{1}{5} + 19 \frac{4}{5} = 34 \frac{5}{5} = 35 \\ 35 \frac{7}{9} + 12 \frac{2}{3} = 35 \frac{7}{9} + 12 \frac{6}{9} = 47 \frac{13}{9} = 48 \frac{4}{9} \\ 28 \frac{3}{12} \times 24 = \frac{339 \times 24}{12} = \frac{339 \times 2}{1} = 678$