Question

помoгите... дам 20 баллов

Answer 1

а)

$frac{7y}{12} = frac{5}{4}\ 28y=60\y=frac{15}{7}$

б)

$frac{46}{15} -frac{29a}{15} =frac{1}{6}\ frac{46-29a}{15}=frac{1}{6} \ 6(46-29a)=15\276-174a=15\a=frac{261}{174}\a=1.5 (a=1frac{1}{2} )$

в)

$(frac{7}{18} +frac{5z}{24} )*frac{9}{11} =frac{1}{3}\ frac{7}{22} +frac{15z}{88} =frac{1}{3} \frac{15z}{88} =frac{1}{22}\ 330z=88\z=frac{44}{165}$

г)

$x(frac{4}{7} +frac{5}{14} -frac{10}{21} )=frac{1}{4} \x(frac{24+15-20}{42} )=frac{1}{4} \frac{19x}{42}=frac{1}{4}  \76x=42\x=frac{21}{38}$

д)

$m-frac{5}{12}m=frac{1}{4} \ frac{7m}{12} =frac{1}{4} \28m=12\m=frac{3}{7}$