Question

#146(а,б))))))))))))))))

Answer 1

1
$frac{4}{15}:x= frac{2}{5} \ x= frac{4}{15}* frac{5}{2} \ x= frac{2}{3}$

2
$frac{2}{15}y+ frac{3}{4}= frac{5}{6} \ frac{2}{15}y=frac{5}{6} - frac{3}{4} \ frac{2}{15}y= frac{1}{12} \ y= frac{1}{12}* frac{15}{2} \ y= frac{5}{8}= 0.625$

Answer 2

$1) frac{4}{15} :x= frac{2}{5} \ x= frac{4}{15} : frac{2}{5} \ frac{4}{15} : frac{2}{5} = frac{4*5}{15*2} = frac{2}{3}$

$2) frac{2}{15} y+ frac{3}{4} = frac{5}{6} \ frac{2}{15} y= frac{5}{6} - frac{3}{4} \ frac{5}{6} - frac{3}{4} = frac{5*2}{6*2} - frac{3*3}{4*3} = frac{10}{12} - frac{9}{12} = frac{1}{12} \ frac{2}{15} y= frac{1}{12} \ y= frac{1}{12} : frac{2}{15} \ frac{1}{12} : frac{2}{15} = frac{1*15}{12*2} = frac{5}{4*2} = frac{5}{8} = frac{5*125}{8*125} = frac{625}{1000} =0.625$