Răspunsuri

2014-09-01T12:52:02+03:00
A-b= 280

a:b=8

a=8b

8b-b=280

7b=280

b=40

a=8*40

a=320
2014-09-01T12:53:48+03:00
X-y=280
x:y=8...8y=x...8y-y=280...7y=280...y=280:7=40...8y=x...8*40=x=320