Question

Помогите пожалуйста.....................

Answer 1

$(3y-7):5=33:15 \ (3y-7):5=2.2 \ 3y-7=2.2cdot5 \ 3y-7=11 \ 3y=11+7 \ 3y=18 \ y=18:3 \ y=6$

$64:72=(7y+3):9 \ 7y+3=64:72cdot9 \ 7y+3=8 \ 7y=8-3 \ 7y=5 \ y= frac{5}{7}$

$35:(21-5y)=5:2 \ 35:(21-5y)=2.5 \ 21-5y=35:2.5 \ 21-5y=14 \ 5y=21-14 \ 5y=7 \ y=7:5 \ y=1.4$

$53:4=212:(6y-8) \ 212:(6y-8)=13.25 \ 6y-8=212:13.25 \ 6y-8=16 \ 6y=16+8 \ 6y=24 \ y=24:6 \ y=4$