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+ 2 - √5) (√10 + 2√3) = ...
JAWAB
(√2 + √3 + √2 + √5)(- √2 + √3 + 2 - √5)(√10 + 2√3)
= (2√2 + √3 + √5)(- √2 + √3 + 2 - √5)(√10 + 2√3)
= (2√2 + √3 + √5)(√10 + 2√3)(-√2 + √3 + 2 - √5)
= (2√20+4√6+√30+6+√50+2√15)(-√2+√3+2-√5)
= (4√5+4√6+√30+6+5√2+2√15)(-√2+√3+2-√5)
=-4√10+4√15+8√5-20-8√3+12√2+8√6-4√30-2√15+3√10+2√30-5√6-6√2+6√3+12-6√5-10+5√6+10√2-5√10-2√30+6√5+4√15-10√3
= -6√10+6√15+8√5-18-12√3+16√2+8√6-4√30
= 2√5(3√3-3√2-2√6+4) - 4√3(3-2√2) + 16√2 - 18