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=3√20+4√20
=7√20
2. √3(√3-√5)
=3-√15
3. 3/√5 × √5/√5
= 3√5/5
4. 7/3√6 ×3√6/3√6
=21√6/54
=7√6/18
5. 4/√5+3 ×√5-3/√5-3
=4√5-12 /-4
=3-√5