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=2√15 + 2√25
=2√15+2.5
=2√15+10
b. (√3+√2)(√5-√3)
=√15-√9+√10-√6
=√15-3+√10-√6
c. (√7+√2)(√7-√2)
=√49-√14+√14-√4
=7-2
5
d. soalnya kurang jelas heheh