(7)
-√2+10√2+5√2
=14√2
(8)
2√3-3√3+√3
=0
6
(1)
5√2-√5
(2)
7-2√21+3
=10-2√21
(3)
5-4
=1
(4)
6-2
=4
(7)
-√2+10√2+5√2
=14√2
(8)
2√3-3√3+√3
=0
6
(1)
5√2-√5
(2)
7-2√21+3
=10-2√21
(3)
5-4
=1
(4)
6-2
=4
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