Simplifique as frações racionalizando os denominadores.
a) \sqrt{7}+35
 \sqrt{7}


b)3 \sqrt{21}+ \sqrt{7}
3 \sqrt{3}

c)90- \sqrt{10}
 \sqrt{10}


d)3 \sqrt{6}-8
4 \sqrt{2}


e) \sqrt{6}-12
2 \sqrt{6}


f)45 \sqrt{3}-15 \sqrt{2}
6 \sqrt{5}


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