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2014-10-24T22:23:08+03:00

a:b=5⇒a=5·b
a+b=25
5·b+b=25
6·b=25
b=25:4
b=6,25
a=5·b=5·6,25=31,25



4 3 4
2014-10-24T22:27:23+03:00