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=(4+5) + (8-4akr5+2akr5-5)
=9 + (8-2akr5-5)
=9 + (3-2akr5)
=11 - 2 akr 5
(4+4√5+5)+(4-4√5+5)+2(4-5)=
8+10-2=
=16
maaf apabila salah