Question

ПОМОГИТЕ ПО МАТЕМАТИКЕ

Answer 1

А) 7/4*12/5*5/21=420/420=1
Б)7/9*33/14*9/5=2079/630=693/210=3,3

Answer 2

$a)1 frac{3}{4} times 2 frac{2}{5} times frac{5}{21} = frac{7}{4} times frac{12}{5} times frac{5}{21} = frac{7 times 12 times 5}{4 times 5 times 21} = frac{1 times 3 times 1}{1 times 1 times 3} = frac{3}{3} = 1$



$b) frac{7}{9} times 2 frac{5}{14} times 1 frac{4}{5} = frac{7}{9} times frac{33}{14} times frac{9}{5} = frac{7 times 33 times 9}{9 times 14 times 5} = frac{1 times 33 times 1}{1 times 2 times 5} = frac{33}{10} = 3 frac{3}{10} = 3.3$