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21akar2 - 5akar5 - 6akar2 + 6akar5
21akar2 - 6akar2 + 6akar5 - 5akar5
15akar2 + 1akar5
mungkin
=(3√49√2)-(√25√5)-(√36√2)+(2√9√5)
=(3.7√2)-(5√5)-(6√2)+(2.3√5)
=(21√2)-(6√2)-(5√5)+(6√5)
=15+1
=16