Kakak-kakak tolong bantu aku dong please

Kakak-kakak tolong bantu aku dong please

$3 frac{2}{5} times 4 frac{1}{7} times frac{21}{34} = frac{17}{5} times frac{29}{7} times frac{21}{34}$

$= frac{1}{5} times frac{29}{1} times frac{3}{2} = frac{87}{10}$

$boxed{ boxed{3 frac{2}{5} times 4 frac{1}{7} times frac{21}{34} = 8 frac{7}{10} }}$