Question

помогите решить 4и5

Answer 1

4. При х=9
х-4.1/2.5=х+0.8/5
10х-41/25=5х+4/25
10х-41=5х+4
5х=45
х=9
5.
0.56:|у|=0.8
0.56/|у|=0.8
56/100|у|=0.8
14/25|у|=0.8
14=20|у|
|у|=14/20
|у|=7/10=0.7
у=0.7
у=-0.7
Ответ: 0.7 -0.7