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Mathematics
Problem
Which of the following should be multiplied with
1
11
+
5
\displaystyle \frac{1}{\sqrt{11}+\sqrt{5}}
11
+
5
1
so that the denominator becomes rational? a)
11
+
5
\sqrt{11}+\sqrt{5}
11
+
5
b)
55
\sqrt{55}
55
c)
11
−
5
\sqrt{11}-\sqrt{5}
11
−
5
d)
6
6
6
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