7/5√11-√11 = ( 7/5-5/5) √11
= 2/5 √11
Kalau enggak dirasionalkan aja
(7√11)/(5-√11) x (5+√11)/(5+√11) = (7√11(5+√11))/(25-11) =(35√11+77)/14 =(5√11+11)/2
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7/5√11-√11 = ( 7/5-5/5) √11
= 2/5 √11
Kalau enggak dirasionalkan aja
(7√11)/(5-√11) x (5+√11)/(5+√11) = (7√11(5+√11))/(25-11) =(35√11+77)/14 =(5√11+11)/2