Răspunsuri

2014-11-17T18:09:53+02:00


ma=a+bsupra 2 rezulta ca a+b =2x15=30

a+b=30

a:b=3r2

echivalent cu a+b=30

                        a=bx3+2

3b+2+b=30

4b+2=3

4b=30-2

4b=28| :4

b=7

a+b=30

a+7=30

a=30-7

a=23