Сократите дробь 75/225 80/100 384/640

75/225=1/3

80/100=4/5

384/640=24/40=3/5

75/225=1/3

80/100=4/5

384/640=3/5

,5%    ,5%    3*60.5\16.5=11(дней)

1)0.28*х*0.35х=980

0.098х*х=980

х*х=10000

х=100

х=-100

2)5х/12*0.72х=480

0.3х*х=480

х*х=1600

х=40

х=-40