Question

252 задание! срочно!

Answer 1

$1) frac{12*5+12*9}{12*21} = frac{12*(5+9)}{12*21} = frac{14}{21} = frac{2}{3} \ \ 2) frac{8*8-8*7}{8*5} = frac{8*(8-7)}{8*5} = frac{8*1}{8*5} = frac{1}{5} \ \ 3) frac{14*5-14*2}{28} = frac{14*(5-2)}{28} = frac{14*3}{28} = frac{3}{2} =1 frac{1}{2} \ \ 4) frac{19*8-19*6}{38} = frac{19*(8-6)}{38} = frac{19*2}{38} = frac{38}{38} =1$