Question

1)5/16*4/5*9/25*5/9 2)19/25*40/57*5/36*9/16 3)2 2/3*1/5*3/4*10 4)18 1/3*1 2/11*1 4/5*15
выполните умножение:

Answer 1

$frac{5}{16} * frac{4}{5} * frac{9}{25} * frac{5}{9} = frac{5*4*9*5}{16*5*25*9} = frac{1*1*1*1}{4*5*1*1} = frac{1}{20} = 0,05$

$frac{19}{25} * frac{40}{57} * frac{5}{36} * frac{9}{16} = frac{19*40*5*9}{25*57*36*16} = frac{1*8 *1 *1}{1*3*4*16} = frac{1*1*1*1}{1*3*4*2} = frac{1}{24}$

$2 frac{2}{3} * frac{1}{5} * frac{3}{4} *10 = frac{8*1*3*10}{3*5*4*1} = frac{2*1*1*2}{1*1*1*1} = frac{4}{1} = 4$

$18 frac{1}{3} * 1 frac{2}{11} *1 frac{4}{5} *15 = frac{18*3+1}{3} * frac{1*11+2}{11} * frac{1*5+4}{5} * frac{15}{1} = frac{55*13*9*15}{3*11*5*1} = \ \ =frac{1*13*3*15}{1*1*1*1} = frac{585}{1} =585$