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Lösung 3.1:7b

Version vom 10:15, 23. Sep. 2008 von Ian (Diskussion | Beiträge)

We multiply the top and bottom of the fraction by the conjugate of the denominator, 7+5 , and see what it leads to:

7−557−757+57+5=72−5257−757+5=7−5577+557−757−755=2572+557−757−752=257+557−757−75=2557−757=25−757=2−257=−35