Question

ПОМОГИТЕ ПОЖАЛУЙСТА
Решите уравнение
1) 3х+0,8/9,6=4,8/3,6
2) 5х+3/9=27/13,5
3) 8/20=28/9х+7

Answer 1

1)3х+0,8/96=4,8/3,6
3х+8/96=48/36
3х+1/12=4/3
3х=4/3-1/12
3х=16/12-1/12
3х=15/12
3х=5/4
х=5/4/3=5/12

2) 5х+3/9=27/13,5
5х=2-1/3  
5х=6/3-1/3    
5х=5/3
х=5/3/5
х=1/3

3) 8/20=28/9х+7
2/5-7=28/9х
2/5-35/5=28/9х
-33/5=28/9х
9х=28/(-33/5)
9х=-28*5/33
9х=-140/33
х=-140/297