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2014-06-14T15:46:44+03:00
A/b=7/4
4a=7b
a=7b/4

a-b=60
7b/4-b=60
7b-4b=240
3b=240
b=240:3
b=80

a=7*80/4
a=7*20
a=140

axb=
140x80=11 200
1 5 1
2014-06-14T15:48:12+03:00
A/b=7/4
a=7b/4

a-b=60

7b/4-b=60   aducem la acelasi numitor

7b-4b=240
3b=240

b=80

a=7*80/4= 7*20=140

a*b=140*80= 11 200